当2x-y=3时 则 2(y - 2x)2 - 4(2x - y)2 - 6x + 3y=?
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
当2x-y\x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的値.
当2x-y/x+y=3时,求代数式2x-y/6x-3y的值
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)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
1、当(x+y)/(x-2y)=3时,2x/y=?