Question

x+y/3+x-y/2=6 4(x+y)-2(x-y)=40

Answer 1

答：

(x+y)/3+(x-y)/2=6

4(x+y)-2(x-y)=40

整理得：

2(x+y)+3(x-y)=36

2(x+y)-(x-y)=20

两式相减得：

4(x-y)=16

x-y=4

代入得：2(x+y)-4=20

x+y=12

结合x-y=4解得：

x=8,y=4