X-2Y/3 - X+2Y/2 =-1 ,X-2Y/4-X+2Y/5 =-1 等于?

问题描述:

X-2Y/3 - X+2Y/2 =-1 ,X-2Y/4-X+2Y/5 =-1 等于?

通分之后
2(x-2y)-3(x+2y)=-6
5(x-2y)-4(x+2y)=-20
解得
x=11 y=-0.5