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问题: 初一数学题

(2+1)(2^2+1)(2^4+1)...(2^64+1)+1=?
请说明思路并写清解题步骤

解答:

解:(2+1)(2^2+1)(2^4+1)...(2^64+1)+1
=(2-1)(2+1)(2^2+1)(2^4+1)...(2^64+1)+1
=(2^2-1)(2^2+1)(2^4+1)…(2^64+1)+1
=(2^4-1)(2^4+1)…(2^64+1)+1
=(2^8-1)…(2^64+1)+1=…
=2^128-1+1
=2^128.