化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)

化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简y(x+y)+(x+y)(x-y)-x^2 化简:5(x-y)+2(x+y)-3(x-y) 化简3(x-y)-7(x--y)+2(y-x) 化简(X-2Y)-(Y-3X) (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , x(x-y)2-(y-x)3 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) (2x+3y)(3x-2y)-(x-2y)(x+2y)化简 化简 [(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3 化简(x-3y)(3x+y)-(2x-3y)(2x-3y) 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x+3y)(x-2y)-(y+2x)(2x-y) 化简