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八年级数学：怎么求x²-xy+y²和x²-y²的值？二次根式基础训练
八年级数学：怎么求x²-xy+y²和x²-y²的值？二次根式，基础训练
实数，无理数，平方根，立方根，二次根式，常考题培优专练132/419
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