已知2x-3y=0则3x-y比x+2y=_数学解答

已知2x-3y=0则3x-y比x+2y=

人气：205 ℃　时间：2020-06-10 20:48:30

解答

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