-5x²(-2xy)²-x²(7x²y²-2x)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
x²/xy-x/y
计算:(xy-x²)×x-y/xy
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(-x-2y)(x²-2xy+4y²)
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
x²-xy-2y²-x-y 因式分解
x³y-2x²y²+xy³
化简:[(x+y)²-(x-y)²]÷2xy
2x(x²y-xy²)+xy(xy-x²)]÷x²y等于多少