(x+2y)/2=(2x-y)/3=1
等号两边都乘以6
3*(x+2y)=2*(2x-y)=6
3x+6y=6 (1)
4x-2y=6 (2)
(2)*3 12x-6y=18 (3)
(1)+(3) 15x=24
x=8/5
y=1/5