【(1)/(x-y)+(1)/(x+y)】÷(2x)/(x²-2xy+y²)

【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²) 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) x-y/x²÷x²-2xy+y²/xy*（xy-x²） 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 化简求值[1-(2x/x+y）]÷ （x²-2xy+y²/3x+3y）+（x²+xy/x& 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 化简：[(x+y)²-(x-y)²]÷2xy (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) 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x&#