Khan Academy(www.khanacademy.org)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.khan academy,learn,videos,lectures,practice,exercises,skills
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可汗学院Khan Academy(cmn.khanacademy.org)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.khan academy,learn,videos,lectures,practice,exercises,skills
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