(2^3N X 4^2N)/(8^N)=?

(2^3N x 4^2N)/(8^N)
=(2^3N x 2^4N)/(2^3N)
=2^4N=4^2N=16^N

圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_1.gif
(2^3N x 4^2N)/(8^N)
= (2^3N x (2^2)^2N)/((2^3)^N)
= (2^3N x 2^4N)/(2^3N)
=2^(3N+4N-2N)
=2^4N