3(x+y)+2(x-3y)=20,30%x+60%y=10%*60
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3(x+y)+2(x-3y)=20,30%x+60%y=10%*60
3(x+y)+2(x-3y)=20,30%x+60%y=10%*60
3(x+y)+2(x-3y)=20,30%x+60%y=10%*60
3(x+y)+2(x-3y)=20
3x+3y+2x-6y=20
5x-3y=20 (1)
0.3x+0.6y=6 (2)
(2)×5+(1)
6.5x=50
x=100/13
y=(5x-20)/3=80/13
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)+2(x-3y)=20,30%x+60%y=10%*60
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