已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)=
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^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xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.
已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值
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x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y