Question

(x-y)的9次方/(y-x)的8次方+(-x-y)的3次方/(x+y)的平方,

Answer 1

(x-y)的9次方/(y-x)的8次方+(-x-y)的3次方/(x+y)的平方

=(x-y)的9次方/[(-1)的8次方×(x-y)的8次方]+[(-1)³×(x+y)³/(x+y)²

=(x-y)的9次方/(x-y)的8次方-(x+y)³/(x+y)²

=(x-y)的(9-8)次方-(x+y)的(3-2)次方

=(x-y)的1次方-(x+y)的1次方

=x-y-(x+y)

=x-y-x-y

=-2y