X+Y=2,XY=-3,则X-Y=?
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=
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
(-3x^y+2xy)-( )=4x^+xy
已知x+y=6,xy=-3,则x^2y+xy^2=?
已知x+y=6,xy=-3,则x^2y+xy^2=
已知x+y=5,xy=-3,则x^2y+xy^2,
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
x+y=-5,xy=3,则-x^3y-xy^3+2x^2y^2等于
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y