Question

计算：（x-y）^7/(y-x)^6+（-x-y）^3/(x+y)^2

Answer 1

（x-y）^7/(y-x)^6+（-x-y）^3/(x+y)^2

=(x-y)^7/(x-y)^6-(x+y)^3/(x+y)^2

=x-y-(x+y)

=x-y-x-y

=-2y