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数学7上：ab互为相反数，cd互为倒数，|x|=5，怎么求这个式子的值
数学7上：ab互为相反数，cd互为倒数，|x|=5，怎么求这个式子的值？
初中数学，有理数基础定义，大小比较，运算法则，培优专题47/82
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