5x+2y=12,3x+2y=-6,求x= ,y=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
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.
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值