计算：（2+1）（2*2+1）（2*4+1）……（2*2n+1）.
问题描述：
计算：（2+1）（2*2+1）（2*4+1）……（2*2n+1）.
答
(2+1)(2^2+1)(2^4+1)…（2^2n+1)
=(2-1)(2+1)(2^2+1)(2^4+1)…（2^2n+1)
=(2^2-1)(2^2+1)(2^4+1)…（2^2n+1)
=(2^4-1)(2^4+1)…（2^2n+1)
=(2^8-1)…（2^2n+1)
=...
=2^4n-1.