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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.

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Learn online and earn valuable credentials from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. Join Coursera for free and transform your career with degrees, certificates, Specializations, & MOOCs in data science, computer science, business, and dozens of other topics.

Access 2000 free online courses from 140 leading institutions worldwide. Gain new skills and earn a certificate of completion. Join today.

网易云课堂，一个专注于成人终身学习的在线教育平台。立足于实用性的要求, 与优质的教育内容创作者一起，为您提供全面、有效的在线学习内容。

学堂在线是清华大学于2013年1...