已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知xy除以x+y=2,求代数式8x-5xy+8y除以-x+3xy-y的值
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.