化简:1/2x-1/(x+y).[(x+y)/2 - (2x²+2xy)/2x]
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+y-2xy)(x+y-2)+(1-xy)²
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
1、x(x-y)(x+y)-x(x+y)^2
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
因式分解:x×x-xy-2y×y-x-y