(-2x³y 4次方)/(-x²y²)*(-x)-(x-2y)(2y+x)-x(xy
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
通分x-y/2x+2y与xy/(x+y)的2次方
x+y 3次方 公式是不是 = (x+y)(x^2-xy+y^2)?
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
(x-2y)²+(2x-4y)(x+y)+(x+y)²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简:(x²+y²/x-y)-(2xy/x-y)
2x+2y/x-y与(x²+y²)/xy通分
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程