(2+1)(2的平方+1)(2的4次方+1).(2的2n次方+1)=?
问题描述:
(2+1)(2的平方+1)(2的4次方+1).(2的2n次方+1)=?
答
原式乘以(2-1)
=(2-1)(2+1)(2^2+1)(2^4+1)……(2^2n+1)+1
=(2^2-1)(2^2+1)(2^4+1)……(2^2n+1)+1
=(2^4-1)(2^4+1)……(2^2n+1)+1
=(2^8-1)……(2^2n+1)+1
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=2^4n-1+1
=2^4n