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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/multivariable-cal
Introduction to the double integral
Watch the next lesson: https://www.khanacademy.org/math/multivariable-calculus/double_triple_integrals/double_integrals/v/double-integrals-2?utm_source=YT&utm_medium=Desc&utm_campaign=MultivariableCalculus
Multivariable Calculus on Khan Academy: Think calculus. Then think algebra II and working with two variables in a single equation. Now generalize and combine these two mathematical concepts, and you begin to see some of what Multivariable calculus entails, only now include multi dimensional thinking. Typical concepts or operations may include: limits and continuity, partial differentiation, multiple integration, scalar functions, and fundamental theorem of calculus in multiple dimensions.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to KhanAcademy’s Multivariable Calculus channel:
https://www.youtube.com/channe....l/UCQQZDc22yCogOyx6D
Subscribe to KhanAcademy: https://www.youtube.com/subscr....iption_center?add_us
English Grammar Course FULL Quiz (250 Questions): https://shawenglish.com/quizze....s/full-basic-english
English Grammar Course MINI Quiz (25 Questions):https://shawenglish.com/course....s/beginner-1-learn-b
👉Free English Video Classes and Community Chat
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Esther is an American teacher from California.
It is the best video course for beginner students. Esther teaches English articles, pronouns, prepositions, adjectives, etc. This video is perfect to help you improve your English speaking, listening, writing, and reading.
0:00 - Beginner English Introduction
0:57 - Vowels and Consonants
5:57 - a/an + Noun
11:26 - Singular / Plural Nouns
20:45 - Subjective Pronouns
26:53 - Subjective Pronouns + Be
33:44 - Subjective Pronouns + Be + Not 38:43 - 'be' Verb Pronoun Questions
49:54 - Review #1 - Subjective Pronouns 53:12 - Grammar Check Up #1
58:55 - What + Be Verb Questions
1:03:43 - This / That
1:07:32 - These / Those
1:11:58 - This / That / These / Those Practice
1:13:47 - Possessive Adjectives
1:21:46 - Possessive Pronouns
1:27:04 - Grammar Check Up #2
1:34:16 - Articles + Noun
1:40:47 - Prepositions: in / on / under 1:45:44 - Beginner Adjectives
1:50:13 - Grammar Check Up #3
1:57:41 - Have / Has
2:01:59 - Don't / Doesn't Have Questions 2:06:26 - Do / Does Have Questions
2:10:42 - Grammar Check Up #4
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Welcome to Multiplying Fractions Using Cancellation with Mr. J! Need help with how to multiply fractions? You're in the right place!
Whether you're just starting out, or need a quick refresher, this is the video for you if you're looking for help with multiplying fractions with cross cancellation. Mr. J will go through multiplying fractions with cross canceling examples and explain how to multiply fractions using cancellation.
✅ Improper Fractions to Mixed Numbers:
https://youtu.be/EpXCr2iax5E
✅ Mixed Numbers to Improper Fractions:
https://youtu.be/96NOYcnmThU
✅ Simplifying Fractions:
https://youtu.be/oFVzcnJfYkg
✅ Plus many more... Just search what topic you are looking for + "with Mr. J" (for example, "adding fractions with Mr. J".
About Math with Mr. J: This channel offers instructional videos that are directly aligned with math standards. Teachers, parents/guardians, and students from around the world have used this channel to help with math content in many different ways. All material is absolutely free.
Click Here to Subscribe to the Greatest Math Channel On Earth: https://goo.gl/XHTrfY
Follow Mr. J on Twitter: @MrJMath5
Email: math5.mrj@gmail.com
Music: https://www.bensound.com/royalty-free-music
Hopefully this video is what you're looking for when it comes to multiplying fractions using cancellation.
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/hu....manities/world-histo
Learn about the outbreak of World War I. Created by Sal Khan.
Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/world-history/euro-hist/world-war-i-tutorial/e/world-war-I-causes?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory
Watch the next lesson: https://www.khanacademy.org/humanities/world-history/euro-hist/american-entry-world-war-i/v/blockades-u-boats-and-sinking-of-the-lusitania?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory
Missed the previous lesson? https://www.khanacademy.org/humanities/world-history/euro-hist/world-war-i-tutorial/v/assassination-of-franz-ferdinand-by-gavrilo-princip?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s World History channel: https://www.youtube.com/channe....l/UC6KRvvmvkCchFMo2E
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us
This video sample from our English Language Arts 1 course helps students learn to create possessive singular nouns using bright and fun visual examples.
Don't forget to subscribe to our channel for more educational videos!
Curious about becoming a Google Certified Educator? Join Tim and Pryscilla to get the low down on these programs, including their background, benefits, and test details.
Are you an administrator interested in learning more about Chromebooks for your school? https://goo.gl/6QbXsu
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Google for Education certifications - https://goo.gl/UNZk9o
For the best selling history themed tabletop games head over to warlord games and check out the Naval warfare in the Black Powder series!
http://store.warlordgames.com/?aff=SimpleHistory
This type of projectile was particularly effective against the sails, masts, and rigging of a ship, shredding and tearing them apart.
Become a Simple History member: https://www.youtube.com/simplehistory/join
Support us on Patreon: https://www.patreon.com/simplehistory
Copyright: DO NOT translate and re-upload our content on Youtube or other social media.
SIMPLE HISTORY MERCHANDISE
Get the Simple History books on Amazon:
https://www.amazon.com/Daniel-....Turner-%60/e/B00H5TY
T-Shirts
https://teespring.com/stores/s....imple-history-offici
Simple history gives you the facts, simple!
See the book collection here:
Amazon USA
http://www.amazon.com/Daniel-Turner/e/B00H5TYLAE/
Amazon UK
http://www.amazon.co.uk/Daniel....-Turner/e/B00H5TYLAE
https://www.facebook.com/Simpl....e-History-5494376751
https://twitter.com/SimpleHistoryYT
Credit:
Created by Daniel Turner
Script: Conan White
Narrator:
Bryan 'Lazlo' Beauregard
Music Credit:
Achaidh Cheide - Celtic by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/r....oyalty-free/index.ht
Artist: http://incompetech.com/
Kings of the Sea: Charles II, James II & the Royal Navy
By J. D. Davies
Ship Decoration, 1630–1780
By Andy Peters
Pepyss Navy: Ships, Men and Warfare, 1649–89
By J. D. Davies
Artillery Through The Ages: A Short Illustrated History Of Cannon, Emphasizing Types Used In America
by Albert C. Manucy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/hu....manities/us-governme
Federalism in the United States. Exclusive and concurrent federal and state powers.
View more lessons or practice this subject at https://www.khanacademy.org/humanities/ap-us-government-and-politics/foundations-of-american-democracy/relationship-between-states-and-the-federal-government/v/federalism-in-the-united-states?utm_source=youtube&utm_medium=desc&utm_campaign=usgovernmentandcivics
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!
Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/chemistry/peri
Definition of ion and ionization energy, and trends in ionization energy across a period and down a group.
Watch the next lesson: https://www.khanacademy.org/science/chemistry/periodic-table/periodic-table-trends-bonding/v/group-trend-for-ionization-energy?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry
Missed the previous lesson? https://www.khanacademy.org/science/chemistry/periodic-table/periodic-table-trends-bonding/v/mini-video-on-ion-size?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry
Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channe....l/UCyEot66LrwWFEMONv
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/linear-algebra/ve
Parametric Representations of Lines in R2 and R3
Watch the next lesson: https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/linear_combinations/v/linear-combinations-and-span?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra
Missed the previous lesson?
https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/vectors/v/intro-unit-vector-notation?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra
Linear Algebra on Khan Academy: Have you ever wondered what the difference is between speed and velocity? Ever try to visualize in four dimensions or six or seven? Linear algebra describes things in two dimensions, but many of the concepts can be extended into three, four or more. Linear algebra implies two dimensional reasoning, however, the concepts covered in linear algebra provide the basis for multi-dimensional representations of mathematical reasoning. Matrices, vectors, vector spaces, transformations, eigenvectors/values all help us to visualize and understand multi dimensional concepts. This is an advanced course normally taken by science or engineering majors after taking at least two semesters of calculus (although calculus really isn't a prereq) so don't confuse this with regular high school algebra.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to KhanAcademy’s Linear Algebra channel:: https://www.youtube.com/channe....l/UCGYSKl6e3HM0PP7QR
Subscribe to KhanAcademy: https://www.youtube.com/subscr....iption_center?add_us
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/chemistry/peri
Correcting a mistake and learning a bit about ion size. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/sc....ience/chemistry/peri
Missed the previous lesson? https://www.khanacademy.org/sc....ience/chemistry/peri
Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channe....l/UCyEot66LrwWFEMONv
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us
Learn the letter V with Ollo the Elephant from Khan Academy Kids!
Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade.
Available on Google Play, Apple, and Amazon app stores:
➡️ http://khan.co/KhanKids-YT-Google
➡️ http://khan.co/KhanKids-YT-Apple
➡️ http://khan.co/KhanKids-YT-Amazon
You can also access other letters of the alphabet on our Letters and Letter Sounds playlist here: http://khan.co/KhanKids-Letters
Subscribe to our channel for more videos like this.
Scientific evidence suggests that the secret to thriving students and a good education are amazing teachers. To teach with us, gift a video or if you want Sprouts to make videos that teach your student or employees, contact us. Just visit http://patreon.com/sprouts
Add you favorite teachers to our playlist:
https://www.youtube.com/playlist?list=PLTp9Bu0cTGUzxe-zSFqVZCFmUh51otfDw&jct=37aFM_gENmVNgsjqXk85mQVocQEfTA
4 GREAT TEACHERS
Michael J. Sandel teaching Justice
https://www.youtube.com/watch?v=kBdfcR-8hEY
Robert Sapolsky teaching Introduction to Human Behavioral Biology
https://www.youtube.com/watch?v=NNnIGh9g6fA
Walter Lewin teaching Physics
https://www.youtube.com/watch?v=4a0FbQdH3dY
Mr. Hester Managing a Classroom
https://www.youtube.com/watch?v=geLvLd3uosk
ADD YOURS TO OUR PLAYLIST
https://www.youtube.com/playlist?list=PLTp9Bu0cTGUzxe-zSFqVZCFmUh51otfDw&jct=vP0U3P5UeAPMRQGBsSKCgsna9ak1Aw
Source:
Eric Hanucheck
http://hanushek.stanford.edu
Raj Chetty
Professor of Economics, Stanford University
http://www.rajchetty.com/chett....yfiles/value_added.h http://www.equality-of-opportu....nity.org/assets/docu
Cold Calling
https://www.youtube.com/watch?v=PARfIwF215k&list=PLPkJlPMF7vNsn8UmmQQwIC4sJYhQ2krrT&index=2
Sposato School of Education
http://www.sposatogse.org/
Teachers Effectiveness
http://scholar.harvard.edu/fil....es/fryer/files/dobbi
Time Spend by Principles
https://web.stanford.edu/~sloe....b/papers/Principal%2
What makes Teaching Great
http://www.suttontrust.com/wp-....content/uploads/2014
What Matters in School is Good Teaching
https://www.economist.com/news..../leaders/21700383-wh
Full Video Script:
https://docs.google.com/docume....nt/d/10Vv-jjXmmwpOIT
Why are timed math drills bad for kids? And how do timed math drills promote math anxiety?
Let's explore the research of Stanford Professor Jo Boaler, the author of Mathematical Mindsets, concerning why timed math tests amplify math anxiety and turn students, especially girls, away from math. To reform math education, we need to shift the focus to a growth mindset for math and onto achieving deep mathematical understanding.
BLOG: Are Timed Math Tests Harmful to Students? http://bit.ly/2bl1Ryc
This presentation was made using Adobe Spark.
★Learn more about the work of Jo Boaler: http://www.youcubed.org
★ Want more FREE weekly math videos? Subscribe Now: http://bit.ly/1OVJnyh
★★ Why Math? Download YOUR Free eBook: http://www.mashupmath.com/resources/
★★★ Learn More About Anthony: http://bit.ly/1KQ1Td3
Image Credit: Emojis provided free by http://emojione.com
Jo Boaler: Stanford researcher, professor of math education and author of the acclaimed book, Mathematical Mindsets.
Math anxiety has now been recorded in students as young as five, and timed tests are a major cause of this debilitating, often lifelong condition.
Timed tests evoke such strong emotions that students often come to believe that being fast with math facts is the essence of mathematics.
This misguided emphasis on speed and memorization has resulted in high numbers of students dropping out of mathematics.
Brain research shows us that under the stress of time pressure, working memory can become blocked, leaving students unable to retrieve what they already know.
The blocking of the working memory and associated anxiety is particularly common among higher-achieving students and girls.
When schools make learning math an anxiety-provoking experience, we turn students away.
The best way to learn math facts is to through mathematical activities that focus understanding number relationships.
This authentic understanding is best achieved through taking the time to think deeply about number strategies. which takes time.
Yet, many people believe that mathematics is only about calculating -- and that the best mathematics thinkers are those who can calculate the fastest.
In truth, skilled mathematicians are often slow with math, because they take the time to think carefully and deeply about mathematics.
We need our students to become powerful thinkers
who can make connections, think logically, and solve complex problems.
To achieve this goal, we must shift the focus of math education away rapid calculation and towards deep mathematical thinking and understanding
This movement in education reform is gaining momentum and your input helps. Please join the conversation and share your thoughts in the comments.
You can learn more about the supporting research and the work of Jo Boaler at YouCubed.org
Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well.
MashUp Math is a great free resource for math students, parents, and teachers. Our lessons are a great resource for struggling students, flipped classroom educators, and homeschool math students.
✔✔✔SUBSCRIBE FOR FREE: https://www.youtube.com/channel/UCtBt...
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✔FOLLOW US ON PINTEREST: http://www.pinterest.com/mashupmath
✔LIKE US ON FACEBOOK: http://www.facebook.com/mashupmath
Our Mission: MashUp Math is our creative solution to reviving students' passion and interest for learning mathematics. As young educators, we know that all students learn math differently and that a one-size-fits-all approach is simply ineffective. The idea that the ability to understand mathematics is reserved for a select few did not sit well with us.
In addition to sharing free teacher resources (which are teacher created resources) in the form of teacher worksheets, we share new YouTube math videos every week that help math teachers and students to better understand mathematics and the common core. Our lessons can be aligned with the common core standards for common core math and are immensely popular with flipped learning educators and anyone experimenting with flipped classroom learning.
As educators, we know what it takes to be a super math teacher and that we can’t always do it alone. In addition to our cool math videos, we share articles, blogs, inspirational quotes, teacher math worksheets, and math worksheets.
Many of our users serve as a special education teacher and use our cool videos to support their special education students with special needs. Our free online math lessons are also high adaptable to your homeschool curriculum and should be added to your list of free homeschool resources.
In todays video we look at Chinas version of o1 and more details on ChatGPT Operator.
Links:
https://chat.deepseek.com/
https://api-docs.deepseek.com/quick_start/pricing/
https://deepmind.google/techno....logies/gemini/flash-
https://www.perplexity.ai/hub/....blog/introducing-the
https://runwayml.com/worlds-of-frames
https://klingai.com/release-notes
https://lumalabs.ai/ray
https://huggingface.co/spaces/tencent/Hunyuan3D-2
Chapters:
0:00 What’s New?
0:31 DeepSeek-R1
3:44 Sam Altman’s Tweet
4:47 ChatGPT Operator & o3-mini
7:54 Gemini 2.0 Flash Thinking Experimental
8:42 Perplexity Sonar
9:40 Runway Frames
12:10 Kling AI Elements
12:48 Luma AI Ray2
13:56 Hunyuan 3D Generator
15:04 Message for Viewers
#ainews #newsyoucanuse
Free AI Resources:
🔑 Get My Free ChatGPT Templates: https://myaiadvantage.com/newsletter
🌟 Receive Tailored AI Prompts + Workflows: https://v82nacfupwr.typeform.com/to/cINgYlm0
👑 Explore Curated AI Tool Rankings: https://community.myaiadvantag....e.com/c/ai-app-ranki
🐦 Twitter: https://twitter.com/TheAIAdvantage
📸 Instagram: https://www.instagram.com/ai.advantage/
Premium Options:
🎓 Join the AI Advantage Courses + Community: https://myaiadvantage.com/community
🛒 Discover Work Focused Presets in the Shop: https://shop.myaiadvantage.com/
The Cold War saw a competition between the world’s two great powers–the democratic, capitalist United States and the communist Soviet Union. Both sides would fight to have the best technology in space and who could achieve the ‘firsts’.
Support the cartoons on patreon:
https://www.patreon.com/simplehistory?ty=c
Get your copy of Simple History: The Space Race today!
https://www.amazon.com/Simple-....History-Space-Daniel
Get your copy of Simple History: The Cold War today!
https://www.amazon.com/Simple-....History-Cold-Daniel-
Simple history gives you the facts, simple!
See the book collection here:
Amazon USA
http://www.amazon.com/Daniel-Turner/e/B00H5TYLAE/ref=sr_ntt_srch_lnk_1?qid=1457289367&sr=8-1
Amazon UK
http://www.amazon.co.uk/Daniel-Turner/e/B00H5TYLAE/ref=sr_ntt_srch_lnk_1?qid=1457289367&sr=8-1
Credits:
Narrator:
Nate Wales 'Call Me Crow'
Call Me Crow Soundcloud
https://soundcloud.com/noahd-3
Animation:
Daniel Turner
Artwork:
Daniel turner
http://www.simplehistory.co.uk
https://www.facebook.com/Simpl....e-History-5494376751
https://twitter.com/simple_guides
Pictures: Wikimedia Commons (Public Domain)
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Please SUBSCRIBE to our channel, LIKE, and SHARE to encourage us to share more useful and interesting knowledge.
請訂閱我們的頻道、點讚、分享，鼓勵我們分享更多有用又有趣的知識。
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Welcome to watch our videos
歡迎觀看我們所創作的的其他影片
1）Basic Conversation 會話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
2) Grammar 語法
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
3）English Speaking
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
4）Funny Jokes 笑話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
5）Vocabulary 詞彙
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
6）English Idioms 英語成語
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
7）Revision Exercise 重温練習
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
8）Fun Games 趣遊戲味
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
9） Tongue Twister 繞口令
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
10）Writing a composition 作文
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP
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Please SUBSCRIBE to our channel, LIKE, and SHARE to encourage us to share more useful and interesting knowledge.
請訂閱我們的頻道、點讚、分享，鼓勵我們分享更多有用又有趣的知識。
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Daily revision 3_simple present/past tense_BGM info
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Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn't mean anything unless you have some knowledge of what calculus is. Let's keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore....precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen....an introduction to precalculus!
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From the 3rd to the 5th centuries, the Roman Empire gets divided and less stable. The Western Roman Empire considered to end in 476 with control of Italy by Odoacer.
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World History on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound peoples and nations together — and torn them apart. Take a journey through time and space and discover the fascinating history behind the complex world we inhabit today.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/physics/centri
Proving that a = v^2/r. Created by Sal Khan.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
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