化简 1.x-2(x+2y)+3（2y-x） 2.-3（xy-2x的平方）-[y的平方-（5xy-4x的平方）+2xy]

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) (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 化简(X-2Y)-(Y-3X) x(x-y)2-(y-x)3 1.（x+2)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3 化简：[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢! 化简 [(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3 (2x+3y)(3x-2y)-(x-2y)(x+2y)化简 [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：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x+3y)(x-2y)-(y+2x)(2x-y) 化简 化简(x-3y)(3x+y)-(2x-3y)(2x-3y)