已知2x-3y=0则3x-y比x+2y=
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已知2x-3y=0则3x-y比x+2y=
已知2x-3y=0则3x-y比x+2y=
已知2x-3y=0则3x-y比x+2y=
2x-3y=0
即2x=3y
x=3/2y
则
(3x-y)/(x+2y)
=(3*3/2y-y)/(3/2y+2y)
=(9/2y-y)/(3/2y+2y)
=(7/2y)/(7/2y)
=1
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