Question

(x+y)/2-(x+y)=-1,3(x+y)-2(2x-y)=8.求x,y的值

Answer 1

(x+y)/2-(x+y)=-1

整理：x+y-2(x+y)=-2

x+y=2①

3(x+y)-2(2x-y)=8

整理：3x+3y-4x+2y=8

5y-x=8②

①+②

6y=10

y=5/3

∴x=2-5/3=1/3

即：方程组的解为x=1/3,；y=5/3