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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

khanacademy.org2019年7月19日

Khan Academy Math

Math on Khan Academy

Math on Khan Academy

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An announcement from Khan Academy

An announcement from Khan Academy

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Algebra Can Unlock the Universe: Dr. Saad Khan on Creativity in Algebra

Algebra Can Unlock the Universe: Dr. Saad Khan on Creativity in Algebra

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热门视频

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2019年7月29日

Online courses from Google

Online courses from Google

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Free Official Courses from Google

Free Official Courses from Google

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Khan Academy Science

Khan Academy Ed Talks with Adam Green, PhD

Khan Academy Ed Talks with Adam Green, PhD

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Free teacher tools and resources from Khan Academy

Free teacher tools and resources from Khan Academy

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Change a life, change the world.

Change a life, change the world.

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已浏览 38.3万次2018年7月10日