若(x+y)2=9,(x-y)2=5,则xy=______.
若(x+y)2=9,(x-y)2=5,则xy=______.
1.若x=2,y=1,则(x-y)(x²+xy+y²)=______.
因式分解:(x+y)(x+y+2xy)+(xy+1)(xy-1)=______.
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.
已知xy=3,x2+xy-2y2=2(x+2y),且x≠-2y,则x+y=______.
因式分解:16(x-y)2-24xy(y-x)=8(x-y)(______).
若x+y分之xy=2,则-x+3xy-y分之3x-5xy+3y=______
因式分解:(x+y-2xy)(x+y-2)+(1-xy)2=______.
分解因式(xy-1)2-(x+y-2xy)(2-x-y)=______.
已知:(2x+3y-4)2+|x+3y-7|=0,则xy=______.
已知x+y=-5,xy=3,试求代数式(x-y)2的值______.
实数x,y满足x≥y≥1和2x2-xy-5x+y+4=0,则x+y=______.