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1/x-1/y=5
求(-x+xy+y)/(2x+7xy-2y)
人气:418 ℃ 时间:2020-04-08 15:29:29
解答
(-x+xy+y)/(2x+7xy-2y)
=(1/x-1/y+1)/(7-2(1/x-1/y))
=(5+1)/(7-10)
=6/(-3)
=-2
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