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初中数学：哪些幂的值等于1？若 (a-1)a+2=1，怎么求a的值？
初中数学：哪些幂的值等于1？若 (a-1)a+2=1，怎么求a的值？
初中数学，幂的运算，幂的大小比较，基础训练，培优专题42/191
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