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数学7上：若|a-2017|和（b+2018）²互为相反数，怎么求a-b的值？
数学7上：若|a-2017|和（b+2018）²互为相反数，怎么求a-b的值？
初中数学，有理数基础定义，大小比较，运算法则，培优专题48/82
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