x²y-2xy+y/y-x²y化简

x²-2xy+y²-9 因式分解 x²-XY-2y²-X-Y x²+xy-2y²-x+7y-6 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT 若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗? 计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy x²-y²+6x+9分之x²+y²-9-2xy （xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²] x/y=2,求x²-3xy+y²/2x²-3xy+5y² 已知x/y=3,求x²+2xy-3y²/x²-2xy+y² x/y=2,求分式x²-xy+3y²/x²+xy+6y² 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 x²y-2xy+y/y-x²y化简 因式分解 x²-2xy+y²-z²