(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1) 怎么算

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(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1)怎么算(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1)怎么算(2+1)(

(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1) 怎么算
(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1) 怎么算

(2+1)(2^1+1)(2^2+1)(2^3+1)(2^4+1)...(2^2n+1) 怎么算
原式=3×1×(2^1+1)(2^2+1)(2^3+1)…(2^2n+1)
=3×(2^1-1)(2^1+1)(2^2+1)(2^3+1)…(2^2n+1)
=3×(2^2-1)(2^2+1)(2^3+1)…(2^2n+1)
=3×(2^3-1)(2^3+1)…(2^2n+1)
……………………………………
=3×(2^2n-1)(2^2n+1)
=3×[2^(n+1)-1]
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