若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.

发布时间:2021-02-25 06:11:58

若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.

网友回答

1/x-1/y=1
xy/x-xy/y=xy
y-x=xy
∴3y-xy-3x/x-xy-y=3(y-x)-xy/(x-y)-xy
=3xy-xy/-xy-xy
=2xy/-2xy
=-1======以下答案可供参考======
供参考答案1:
y-x=xy
原式=【3xy-xy】/【-xy-xy】=2/[-2]=-1
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