〔9x^3y^2-6x^2y+xy^2〕÷〔-3xy〕=多少
x+y=3,xy=-2.求(3xy+10y)+〔5x-(2xy+2y-3x)〕
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
x-y=4,xy=-2,求代数式〔2x+3y-2xy〕-〔x+4y+xy〕-〔3xy+2y-2x〕的值
x^2-xy-6y^2+3xy+y+2
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
x*-2xy+3y*=9 4x*-5xy+6y*=30
化简.x^2-3xy/x^2-6xy+9y^2
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.