🎯 Méthode simple pour multiplier des fractions
✅ 4 exemples corrigés pas à pas

🔎 Chapitres
00:18 | Exercice 1
01:00 | Exercice 2
01:37 | Exercice 3
02:04 | Exercice 4 : simplifier une fraction ?

This chemistry video tutorial provides a basic introduction into the types of chemical bonds such as polar covalent bonds, nonpolar covalent bonds and ionic bonds. It discusses the difference between ionic bonding and covalent bonding. Ionic bonds can be identified by looking for a metal combined with a nonmetal. Covalent bonds typically occur among 2 or more nonmetals. Covalent bonding involves a sharing of electrons and ionic bonding forms as a result of a transfer of electrons from the metal to the nonmetal producing ions with opposite charge which are attracted to each other. The electrostatic force of attraction produces the ionic bond that holds the cations and anions together. Polar covalent bonds have unequal sharing of electrons between the atoms where as nonpolar covalent bonding have a relatively equal sharing of electrons between the atoms attached to the bond. Polar covalent bonds typically have an electronegativity difference of 0.5 or more where as nonpolar covalent bonds have a value difference of 0.4 or less.

Ionization Energy:
https://www.youtube.com/watch?v=LNVEBURpTcQ

Electron Affinity:
https://www.youtube.com/watch?v=KhLijA77WQE

Atomic Radius:
https://www.youtube.com/watch?v=4Url0pjbcuU

Bond Energy & Bond Length:
https://www.youtube.com/watch?v=U43-NTF-79E

Electronegativity:
https://www.youtube.com/watch?v=c9n2-gkVsaw

Periodic Trends:
https://www.youtube.com/watch?v=Gy9HR65DpYQ

__________________________________
Polar & Nonpolar Covalent Bonding:
https://www.youtube.com/watch?v=OvjkMqGzgiY

Bond Polarity & Dipole Moment:
https://www.youtube.com/watch?v=ds5HXmBkO0Y

Ionic Radius:
https://www.youtube.com/watch?v=62pf6YOG6Ag

Lattice Energy:
https://www.youtube.com/watch?v=I61-N0GuSx8

Born Haber Cycle:
https://www.youtube.com/watch?v=DI-bwx8r3r8

Bond Energy Calculations:
https://www.youtube.com/watch?v=0Tm6JMeYX5g

___________________________________
Lewis Structures - Mega Review:
https://www.youtube.com/watch?v=PeY_sihSh8E

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/angle-addition-formula-proofs/e/understanding-angle-addition-formulas?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Watch the next lesson: https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/angle-addition-formula-proofs/v/proof-angle-addition-cosine?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Missed the previous lesson?
https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/angle-addition-formulas-trig/v/double-angle-formula-for-cosine-example-c?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Trigonometry on Khan Academy: Big, fancy word, right? Don't be fooled. Looking at the prefix, tri-, you could probably assume that trigonometry ("trig" as it's sometimes called) has something to do with triangles. You would be right! Trig is the study of the properties of triangles. Why is it important? It's used in measuring precise distances, particularly in industries like satellite systems and sciences like astronomy. It's not only space, however. Trig is present in architecture and music, too. Now you may wonder...how is knowing the measurement and properties of triangles relevant to music?? THAT is a great question. Maybe you'll learn the answer from us in these tutorials!

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 Trigonometry channel:
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Looking for an introductory tutorial on evaluating exponents? You have come to the right place!

In this video we cover:

A quick review of what exponents are and how they represent repeated multiplication. I also review briefly the powers of ten rules and how to quickly solve them. The video focuses on how to solve basic math equations when exponents are involved.

Other Videos Mentioned:
Powers of Ten: https://youtu.be/9bx4ChX82_8
Multiplying Whole Numbers By A Power of Ten: https://youtu.be/kiEMc0CrNQY


Improved math is a channel created to provide additional instruction on essential math concepts. I am passionate about math and I know firsthand how important math concepts are in the real world.

Teachers, parents, guardians, homeschoolers, and students can use these videos to help reinforce math skills.

For more information on math topics or for free printable worksheets and answer sheets, you can also visit my website at improvedmath.com

#exponents
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Stephen Hawking thought an asteroid impact posed the greatest threat to life on Earth. Thanks to Kiwico for sponsoring this video. For 50% off your first month of any crate, go to https://kiwico.com/veritasium50
For other potential world ending catastrophes, check out Domain of Science: https://ve42.co/DoS

Special thanks to:
Prof. Dave Jewitt from UCLA Earth, Planetary, and Space Sciences
Prof. Mark Boslough from Sandia National Labs
Scott Manley: https://www.youtube.com/user/szyzyg
Ryan Wyatt at Morrison Planetarium
Prof. Amy Mainzer
Alexandr Ivanov for the opening shot of Chelyabinsk Meteor

Maps of Asteroid Impacts —https://ve42.co/Map

Time passing animation from Universe Sandbox - http://universesandbox.com/

Opposition Effect — https://ve42.co/Belskaya2000
Belskaya, I. N., & Shevchenko, V. G. (2000). Opposition effect of asteroids. Icarus, 147(1), 94-105.

Potentially Hazardous Asteroids — https://ve42.co/Perna2013
Perna, D., Barucci, M. A., & Fulchignoni, M. (2013). The near-Earth objects and their potential threat to our planet. The Astronomy and Astrophysics Review, 21(1), 65.

Survey of Potentially Hazardous Asteroids — https://ve42.co/NEOSurvey

Population Vulnerability — https://ve42.co/Rumpf2017
Rumpf, C. M., Lewis, H. G., & Atkinson, P. M. (2017). Population vulnerability models for asteroid impact risk assessment. Meteoritics & Planetary Science, 52(6), 1082-1102.

Size distribution of NEOs — https://ve42.co/Trilling17
Trilling, D. E., Valdes, F., Allen, L., James, D., Fuentes, C., Herrera, D., ... & Rajagopal, J. (2017). The size distribution of near-earth objects larger than 10 m. The Astronomical Journal, 154(4), 170.

2020 NEOWISE Data Release — https://ve42.co/NEOWISE

National Research Council Report— https://ve42.co/Defending
Board, S. S., & National Research Council. (2010). Defending planet earth: Near-Earth-Object surveys and hazard mitigation strategies. National Academies Press.

Tug Boat — https://ve42.co/Schweickart03
Schweickart, R. L., Lu, E. T., Hut, P., & Chapman, C. R. (2003). The asteroid tugboat. Scientific American, 289(5), 54-61.

Gravity Tractor 1 — https://ve42.co/Lu05
Lu, E. T., & Love, S. G. (2005). Gravitational tractor for towing asteroids. Nature, 438(7065), 177-178.

Laser Ablation — https://ve42.co/Thiry14
Thiry, N., & Vasile, M. (2014). Recent advances in laser ablation modelling for asteroid deflection methods. SPIE Optical Engineering+ Applications, 922608-922608.

Yarakovsky Effect — https://ve42.co/Yara

DART Mission — https://ve42.co/DART

Nuclear 1 — https://ve42.co/Ahrens92
Ahrens, T. J., & Harris, A. W. (1992). Deflection and fragmentation of near-Earth asteroids. Nature, 360(6403), 429-433.

Nuclear 2 — https://ve42.co/Bradley10
Bradley, P. A., Plesko, C. S., Clement, R. R., Conlon, L. M., Weaver, R. P., Guzik, J. A., ... & Huebner, W. F. (2010, January). Challenges of deflecting an asteroid or comet nucleus with a nuclear burst. In AIP Conference Proceedings (Vol. 1208, No. 1, pp. 430-437). American Institute of Physics.

Researched and Written by Petr Lebedev, Jonny Hyman and Derek Muller
3D animations, VFX, SFX, Audio Mixing by Jonny Hyman
2D animation by Ivy Tello
Intro animation by Nicolas Pratt
With Filming by Raquel Nuno

Music from https://epidemicsound.com "Stellar Dance" "Orbit" "That Notebook" "What We Discovered" "Out of Poppies" "Handwriting"
Images and video supplied by Getty Images

The Principal Lecturer and Lead for Planning and Admissions in the School of Education discusses training as a teacher, the unique rewards the profession brings and why Brighton is the option for you.

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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/work-a

Work needed to compress a spring is the same thing as the potential energy stored in the compressed spring. Created by Sal Khan.

Watch the next lesson: https://www.khanacademy.org/science/physics/work-and-energy/hookes-law/v/spring-potential-energy-example-mistake-in-math?utm_source=YT&utm_medium=Desc&utm_campaign=physics

Missed the previous lesson? https://www.khanacademy.org/science/physics/work-and-energy/hookes-law/v/intro-to-springs-and-hooke-s-law?utm_source=YT&utm_medium=Desc&utm_campaign=physics

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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Join our Circle Time hosts as they read the book Baby Pigs by Bellwether Media. See real-life photos of little piglets, and learn about how they grow, play, and dig for food. Then see more baby animals from the county fair. Don’t miss the ducklings in the fountain! Wrap up with a wonderful segment of Show & Tell, where friends share their artwork with us.

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This physics video tutorial explains how to solve any circuit problem with capacitors in series and parallel combinations. This video explains how to calculate the electric charge and voltage on every capacitor in a series and parallel circuit. In a series circuit, the capacitors have the same charge and the voltages are additive following kirchoff's voltage law. In a parallel circuit, all of the capacitors have the same voltage but their charges are additive. This tutorial contains plenty of examples and practice problems.

Capacitors - Basic Introduction:
https://www.youtube.com/watch?v=BimpNou0orc

How To Solve DC Circuits:
https://www.youtube.com/watch?v=eFlJy0cPbsY

KCL and KVL Circuit Analysis:
https://www.youtube.com/watch?v=2Zu3ppq3n8I

Equivalent Capacitance:
https://www.youtube.com/watch?v=PPhSmZ6w9WY

Capacitors In Series and Parallel:
https://www.youtube.com/watch?v=zaT4JorVUz0

__________________________
More Example Problems:
https://www.youtube.com/watch?v=a-gPuw6JsxQ

Electron Flow In Capacitors:
https://www.youtube.com/watch?v=iQZknlJjaj4

RC Circuit Physics Problems:
https://www.youtube.com/watch?v=PLQrPqYlPmI

Voltmeters and Ammeters:
https://www.youtube.com/watch?v=NLPSHwDUYrY

Wheatstone Bridge Circuit:
https://www.youtube.com/watch?v=jFvVtB10B1I

______________________________
Basic Electronics For Beginners:
https://www.youtube.com/watch?v=uXr4lXYjXuU

Magnetic Force on a Wire:
https://www.youtube.com/watch?v=nv28Cp-ILJ0

Magnetic Force on a Moving Charge:
https://www.youtube.com/watch?v=7MBawzone30

The Homopolar Motor:
https://www.youtube.com/watch?v=6Oj4qvCR6ow

Physics PDF Worksheets:
https://www.video-tutor.net/ph....ysics-basic-introduc

Learn the letter V with Ollo the Elephant from Khan Academy Kids!

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You can also access other letters of the alphabet on our Letters and Letter Sounds playlist here: http://khan.co/KhanKids-Letters

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Nouns Part 3: Singular & Plural Nouns

What are singular and plural nouns? Learn how to make a singular noun into plural noun through many examples.

To go to "Nouns Part 4" click the link below :)

"Part 4: Irregular Plural Nouns"
https://youtu.be/sG10HhMpans

If you've missed Part 1 & Part 2 in "Nouns" click the links below!!

"Part 1: What is a Noun"
https://youtu.be/fnCh8UexntQ

"Part 2: Common & Proper Nouns"
https://youtu.be/ppNtch3wRJ4





For the "Noun Series" click the link below :)

https://www.youtube.com/playli....st?list=PLGIhw0VkiEN

For the entire "Verbs Series" click the link below :)

https://www.youtube.com/playli....st?list=PLGIhw0VkiEN

For the "Adjectives Series" click the link below :)

https://www.youtube.com/playli....st?list=PLGIhw0VkiEN

Can you think of some things that are green? How about a hose and a pear! earn about secondary colors green, orange, and purple with Sandy the Dingo 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.

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You can also access other color videos on our Colors playlist here: http://khan.co/KhanKids-Colors.

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Ever feel like there's an international team of bad guys changing all of the easily remembered chemical names and turning them into test-failing, number-infused, pain-in-the-neck names? Well... you're not wrong. IUPAC exists, but try to keep in mind that they're doing it for the greater good. In this episode, Hank talks about IUPAC, prefixes, suffixes, ranking, numbers for carbon chains, and cis or trans double bonds.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
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Common Functional Groups: http://en.wikipedia.org/wiki/F....unctional_group#Tabl
--
Table of Contents

IUPAC 0:00
Every Organic Compound Has Only One Name 1:02
Prefixes 2:16
Suffixes 2:47
Ranking Functional Groups 4:18
Lowest Possible Numbers for Carbon Chains 1:54
Cis or Trans for Double Bonds 6:35
--

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Letra

La Potranca Margarita a la granja hoy llego
con su cola bien peinada y su piel brillando al sol
Los caballos de reojo cuando la miran pasar
admirando su belleza, no hacen más que preguntar:

¿Quién será? La Potranca Margarita
¿Dónde va? A pasear por el jardín
Ella es la potranca más bonita
Y sin mas ni más, la siguen detrás,
todos juntos a pasear

La Potranca Margarita es hermosa como el sol
tiene largas las pestañas se parece a una flor
Los caballos de la granja cuando la miran pasar
se ponen colorados y vuelven a preguntar:

¿Quién será? La Potranca Margarita
¿Dónde va? A pasear por el jardín
Ella es la potranca más bonita
Y sin mas ni más, la siguen detrás,
todos juntos a pasear
Y sin mas ni más, la siguen detrás,
todos juntos a pasear

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Título Original: La Potranca Margarita
Autor/Compositor: Marceillac, Eduardo Alberto - Rogier, Cecilia María Teresa
Intérprete: Dúo Tiempo de Sol

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Let’s spend some more time on matching games. Preschoolers and kindergartners will have a lot of fun putting things back after a severe storm. Excitement and joy are guaranteed when everything is back at their places. This video will help you to develop logic skills for toddlers.

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Struggling with the GED Math test? This is the ultimate guide to help you pass the 2025 GED Math test with confidence. In Part 1 of our 4-part series, we break down the 10 most essential basic math skills you MUST know. Follow along as we solve real test-style questions step-by-step!

✅ Get your FREE matching practice test to lock in what you've learned:
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This video is the first step in our complete guide to mastering the GED Math section. By the end, you'll understand the concepts and the smart way to solve problems, saving you time on the actual test.

⏱️ TIMESTAMPS / WHAT YOU'LL LEARN:

0:00 - Intro
[00:23] - Question 1: Ordering Fractions & Decimals
[02:07] - Question 2: Greatest Common Factor (Word Problem)
[05:46] - Question 3: Order of Operations (PEMDAS)
[07:39] - Question 4: Scale Drawings & Proportions
[09:04] - Question 5: Simplifying with Exponent Rules
[11:23] - Question 6: Finding the Unit Rate
[12:56] - Question 7: Identifying Undefined Expressions
[14:06] - Question 8: Simplifying Square Roots
[15:38] - Question 9: Distance on a Number Line (Absolute Value)
[16:57] - Question 10: Multi-Step Percentages (Tax & Discount)

▶️ WATCH THE FULL GED MATH SERIES:
Part 1: Basic Math (You are here!)
Part 2: Algebra - [Coming Up]
Part 3: Geometry - [Coming Up]
Part 4: Data Analysis - [Coming Up]

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Important GED Videos
1. Full GED Math Test - Best Video
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2. No Calculator GED Math Section
https://youtu.be/VnjbJLi7VL4
3. Complete GED Science Course
https://youtu.be/tlD1vt5SV-A
5. GED Social Studies
https://youtu.be/lEZKVMF_ofY

#GEDMath #GEDTest #MathGuide #GEDPrep

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