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2025年1月15日 · What’s new in Khan Academy’s middle school ELA courses? Our 7th– and 8th-grade reading & vocabulary courses were already packed with knowledge-building reading …

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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 …

Inspire a lifetime of learning with our educational app for kids ages 2-7. Kids can learn reading, writing, math, counting, ABCs, addition, subtraction, social-emotional skills, & more. 100% free …

Introduction to number systems, including binary, decimal, and hexadecimal, with examples and explanations.

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2022年6月2日 · Khan Academy is a not-for-profit educational organization started by Salman Khan in 2008. Our mission is to provide a free, world-class education to anyone, anywhere. …

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