{2x-3y=3 x+3y=6
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{2x-3y=3 x+3y=6
![{2x-3y=3 x+3y=6](/uploads/image/z/16418675-11-5.jpg?t=%EF%BD%9B2x-3y%3D3+x%2B3y%3D6)
x=6-3y,2*(6-3y)-3y=3,y=1,x=6-3*1=3
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
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
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
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