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八年级数学：若xy=5，x+y=-7，怎么求二次根式的值？你觉得难吗？
八年级数学：若xy=5，x+y=-7，怎么求二次根式的值？你觉得难吗？
实数，无理数，平方根，立方根，二次根式，常考题培优专练386/419
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