3x+3y=5 3x+3y-6y-6x=?
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
【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
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y