2分之x+y+3分之x-y=8 4(x+y)-5(x-y)=-28

问题描述:

2分之x+y+3分之x-y=8 4(x+y)-5(x-y)=-28
明天就要交....

(x+y)/2+(x-y)/3=84(x+y)+8/3(x-y)=64 4(x+y)-5(x-y)=-28 4(x+y)-5(x-y)-【4(x+y)+8/3(x-y)】=-92-(8/3+5)(x-y)=92x-y=12(x+y)/2+(x-y)/3=8 (x+y)/2+4=8x+y=8x=10y=-2