(x-2y)³·(2y-x)的2n-1次方÷(x-2y)的2n+2次方

(x-2y)³·(2y-x)的2n-1次方÷(x-2y)的2n+2次方
(x-2y)³·(2y-x)的2n-1次方÷(x-2y)的2n+2次方

(x-2y)³·(2y-x)的2n-1次方÷(x-2y)的2n+2次方
(x-2y)³·(2y-x)的2n-1次方÷(x-2y)的2n+2次方
=-(x-2y)³·(x-2y)的2n-1次方÷(x-2y)的2n+2次方
=-(x-2y)²

(x-2y)³*(-1)^(2n-1)(x-2y)^(2n-1)÷(x-2y)^(2n-1+3)
=(x-2y)³*(-1)*1/(x-2y)³
=-1