x²+2xy+y²+2x+2y

x-y/x²÷x²-2xy+y²/xy*（xy-x²） 计算：x²+2xy+y²/xy-y².x²-2xy+y²/xy+y&# (-x-2y)(x²-2xy+4y²) x²-xy-2y²-x-y 因式分解 x³y-2x²y²+xy³ 化简：[(x+y)²-(x-y)²]÷2xy 化简求值：x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x 化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) X²+2xy+y²/xy乘x²-2xy+y²/xy+y²= 【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)