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已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值
人气:287 ℃ 时间:2020-05-22 04:41:35
解答
5x+2xy-5y/x-4xy-y
=5(x-y)+2xy/(x-y)-4xy
=5*3xy+2xy/3xy-4xy
=17xy/(-xy)
=-17
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