计算[(x+y)²—(x—y)²]÷4xy(过程要)
计算:(xy-x²)×x-y/xy
分式除法(2y-x)÷x²-4xy+4y²/x+3xy要过程
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
(-x²+2xy-y的平方)-2(xy—3x²)+3(2y的平方-xy) 计算.
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
分解因式计算6x³y(x-y)³-4xy³(y-x)²
计算x²y³-2x(4xy³)
计算:(xy-x²)乘 x-y分之xy
计算:(x-y)(x²+xy+y²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-2x²y³)²×(xy)³要过程