已知x+y=6,xy=-3,则x²y+xy²=
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知:X+Y=-3,XY=2,X²Y+XY²
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xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²