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初中数学：怎么求x²-xy+y²的值？二次根式培优拓展题，学浪计划
初中数学：怎么求x²-xy+y²的值？二次根式基础巩固，培优拓展题
实数，无理数，平方根，立方根，二次根式，常考题培优专练261/419
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