若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.
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若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.X-XY-Y/3Y-
若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.
若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.
若X/1-Y/1=1,求X-XY-Y/3Y-XY-3X的值.
X-XY-Y/3Y-XY-3X
上下同除以xy
=(1/y-1/x-1)/(3/x-3/y-1)
=[-1-(1/x-1/y)]/[3(1/x-1/y)-1]
=(-1-1)/(3-1)
=-1
X/1-Y/1=1
x-y=xy
(X-XY-Y)/(3Y-XY-3X)
=(xy-xy)/(3Y-XY-3X)
=0
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