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並前往https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:rational-exponents-radicals/x2f8bb11595b61c86:radicals/v/introduction-to-square-roots

Intro to square roots (video) | Radicals - Khan Academy

Learn about the square root symbol (the principal root) and what it means to find a square root. Also learn how to solve simple square root ...

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