可汉学院(Khan Academy) -超过1200个视频教程,内容涵盖自基础算术、代数至微分方程、物理学、化学、生物学和金融学。
Over 1200 videos lessons covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance.
可汉学院(Khan Academy) -超过1200个视频教程,内容涵盖自基础算术、代数至微分方程、物理学、化学、生物学和金融学。
Over 1200 videos lessons covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance.
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