x+y=-5,xy=3,则-x^3y-xy^3+2x^2y^2等于
x+y=-5,xy=3,则-x^3y-xy^3+2x^2y^2等于
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
(x+2y-3y)- (-2x-y+xy ) 其中x+y=0.5 xy等于-0.5
已知x-y=4xy,则2x+3xy-2yx-2xy-y
若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x-y的绝对值等于4,xy=-3,xy^2+x^2y=?
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=