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约分①(x+y)y/xy²③x²+xy/(x+y)²④x²-y²/(x-y)²求正确答案过程
人气:396 ℃ 时间:2019-11-01 06:36:16
解答
①(x+y)y/xy²=x+y/xy
③ x²+xy/(x+y)²=x(x+y)/(x+y)²=x/x+y
④ x²-y²/(x-y)²=(x+y)(x-y)/(x-y)²=x+y/(x-y)
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