已知x-y=3
已知x-y=3
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)
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知3X=5Y,则X:Y=
已知:3x=7y,则x:y=------------------
已知x+y=3,求代数式3(x+y)
已知|3-y|+|x+y|=0,求x+yxy
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)