(2+1)(4+1)(16+1)(256+1)(65536+1)=?
问题描述:
(2+1)(4+1)(16+1)(256+1)(65536+1)=?
答
你看这么做行不行(个人意见)
看整个式子的前两个括号。
(2+1)(4+1)=(4-1)(4+1)=16-1(平方差用法)
再拿回式子里(16-1)(16+1)=256-1
再拿回(256-1)(256+1)=65536-1
再拿回(65536-1)(65536+1)=4294967296-1
答
(2+1)(4+1)(16+1)(256+1)(65536+1)
=(2-1)(2+1)(4+1)(16+1)(256+1)(65536+1)
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2^4-1)(2^4+1)(2^8+1)(2^16+1)
=(2^8-1)(2^8+1)(2^16+1)
=2^32-1