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二次根式培优拓展题，求a-200²的值？请看解题过程，变形好灵活
二次根式培优拓展题，求a-200²的值？请看解题过程，变形好灵活。
实数，无理数，平方根，立方根，二次根式，常考题培优专练16/419
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