(x-y)(x²+xy+y²);(x+y-1)²;(a+1/2)²
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
化简求值[1-(2x/x+y)]÷ (x²-2xy+y²/3x+3y)+(x²+xy/x&
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
因式分解:(1)x²y-2xy²+y³ (2)(x+2y)²-y²
(x+y)(x²-xy+y²)—xy(x+y)因式分解
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
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
谢谢(关于因式分解)2x²+xy-y²-4x+5y-6x²-2x-14(x-y+1)+y(