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八年级数学：怎么求x²-xy+y²，和x²-y²的值？二次根式常考题
八年级数学：怎么求x²-xy+y²，和x²-y²的值？二次根式常见考题
实数，无理数，平方根，立方根，二次根式，常考题培优专练122/419
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