(x+2y)^7÷(x+2y)^2÷(-x-2y)^3该怎么算?

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y [(x+2y)²-(x+y)(x-y)-7y²】÷（2y） 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 18(x+y)^8(x-y)^7÷[3(x+y)^3(x-y)^3]^2 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , [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 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [(-2x-y)^2-(2x+y)(2x-y)]÷2y-1/2y [(x+2y)^2-(x-y)(x+2y)-5y^2]÷(2y) [(2x+y)-(2x+y)(2x-y)]÷2y-二分之一y 化简【(x²+y²)-(x-y)²+2y(x-y)】÷4y 计算:y×(y/x)^3÷[-(x^2)/y]^-2 （x-y/x+y）^2÷（y-x/x^2+2xy+y^2)^2 [4y(2x-y)-2x(2x-y)]÷(2x-y) [4y（2x-y)-2x(2x-y)]÷（2x-y)怎么做