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(2+1)(2^2+1)(2^4+1)+。。。。+(2^2n+1)之间应该是“*”号,不是“+”
(2+1)*(2^2+1)*(2^4+1)*……*(2^2n+1)
解:原式=(2-1)*(2+1)*(2^2+1)*(2^4+1)*……*(2^n+1)
=(2^2-1*(2^2+1)*(2^4+1)*……*(2^n+1)
=(2^4-1)(2^4+1)*……*(2^n+1)
=(2^n+1)(2^n-1)
=2^2n-1
(2+1)*(2^2+1)*(2^4+1)*……*(2^2n+1)
解:原式=(2-1)*(2+1)*(2^2+1)*(2^4+1)*……*(2^n+1)
=(2^2-1*(2^2+1)*(2^4+1)*……*(2^n+1)
=(2^4-1)(2^4+1)*……*(2^n+1)
=(2^n+1)(2^n-1)
=2^2n-1
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