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八年级数学：若根号-(a-2020)²是二次根式，怎么求(-1)a的值？
八年级数学：若根号-(a-2020)²是二次根式，怎么求(-1)a的值？
实数，无理数，平方根，立方根，二次根式，常考题培优专练61/419
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