化简(x-3y)(3x+y)-(2x-3y)(2x-3y)

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: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(x-y)2-(y-x)3 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , [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) 化简(x-3y)(3x+y)-(2x-3y)(2x-3y) [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) (2x+3y)(3x-2y)-(x-2y)(x+2y)化简 计算：x+2y/x-y+2x/y-x-3y/x-y [(x-2y)²+(x+y)(3x-y)-3y²]÷2x化简。 化简 [(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3