已知2x-3y=0则3x-y比x+2y=

问题描述:

已知2x-3y=0则3x-y比x+2y=

2x-3y=0
即2x=3y
x=3/2y

(3x-y)/(x+2y)
=(3*3/2y-y)/(3/2y+2y)
=(9/2y-y)/(3/2y+2y)
=(7/2y)/(7/2y)
=1