Hoang Giang Share
Janusz
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Veinas bọt EPE máy móc
Wendy Ye
Khan Academy is a nonprofit providing a free, world-class education for anyone, anywhere. Our interactive practice problems, articles, and videos help students succeed in math, biology, chemistry, physics, history, economics, finance, grammar, and many other topics.
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Our resources have been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy each month.
Want to extend your learning beyond YouTube? Practice what you've just discovered for free: www.khanacademy.org
