(2-1)(2+1)(2^2+1)(2^+1)等于几啊?
问题描述:
(2-1)(2+1)(2^2+1)(2^+1)等于几啊?
最后一个是(2^4+1)
答
(2-1)(2+1)(2^2+1).(2^2n+1)
=(2^2-1)(2^2+1).(2^2n+1)
=(2^4-1).(2^2n+1)
=(2^2n-1)(2^2n+1)
=2^4n-1最后一个是(2^4+1)(2-1)(2+1)(2^2+1)(2^4+1)=(2^2-1)(2^2+1)(2^4+1)=(2^4-1)(2^4+1)=2^8-1(2^2+1)(2^4+1)不是应该=2^6+2^2+2^4+1=2^12+1吗?平方差公式先(2^2-1)((2^2+1)=(2^4-1)再×(2^4+1)又是平方差公式