(2+1)•(2•2+1)•(2•2•2•2+1)……•(2•2•2快呀急!
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(2+1)•(2•2+1)•(2•2•2•2+1)……•(2•2•2快呀急!
(2+1)•(2•2+1)•(2•2•2•2+1)……•(2•2•2
快呀
急
!
(2+1)•(2•2+1)•(2•2•2•2+1)……•(2•2•2快呀急!
补上乘以1=(2-1) 这项.
然后不断用平方差公式
(2-1)*(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)(2^32+1)(2^64+1)
=(2^2-1)*(2^2+1)(2^4+1)(2^8+1)(2^16+1)(2^32+1)(2^64+1)
=(2^4-1)*(2^4+1)(2^8+1)(2^16+1)(2^32+1)(2^64+1)
=(2^8-1)*(2^8+1)(2^16+1)(2^32+1)(2^64+1)
=(2^16-1)*(2^16+1)(2^32+1)(2^64+1)
=(2^32-1)*(2^32+1)(2^64+1)
=(2^64-1)*(2^64+1)
=2^128-1