这道题怎么解？？？ 要解题思路及答案！！！！

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(2+1)(2^2+1)……(2^2n+1)
=(2-1)(2+1)(2^2+1)……(2^2n+1)/(2-1)
=(2^2-1)(2^2+1)…核和滑…改腊(2^2n+1)/棚猛1
=(2^4-1)(2^4+1)……(2^2n+1)
=……
=2^4n-1

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