作业帮若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.
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若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.
若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.
若1/x-1/y=1,求3y-xy-3x/x-xy-y的值.
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
y-x=xy
原式=【3xy-xy】/【-xy-xy】=2/[-2]=-1
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