已知xy+x=-3,xy-y=2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
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x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知xy为正整数,3xy=2x+3y+5.求xy=?
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-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)