化简:x-y/x+3y÷x^2-y^2/x^2+6xy+9y^2-2y/x+y

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简y(x+y)+(x+y)(x-y)-x^2 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(x-2y)²+(x+y)(3x-y)-3y²]÷2x化简。 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-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 化简(X-2Y)-(Y-3X) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 x(x-y)2-(y-x)3 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简：[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢! [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y [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