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初中数学：若a-b=1，怎么求a²-b²-2b的值？整式乘法公式基础题
初中数学：若a-b=1，怎么求a²-b²-2b的值？整式乘法公式基础题
初中数学，幂的运算，幂的大小比较，基础训练，培优专题119/191
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