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Re: [obm-l] ex..
S = 1/2 + 3/2^2 + 5/2^3 + ... + (2n-1)/2^n
- S/2 = - 1/2^2 - 3/2^3 - ... - (2n-3)/2^n - (2n-1)/2^(n+1)
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S/2 = 1/2 + 2/2^2 + 2/2^3 + ... + 2/2^n - (2n-1)/2^(n+1)
S/2 = 1/2 + 1/2 + 1/2^2 + ... + 1/2^(n-1) - (2n-1)/2^(n+1)
Fazendo as contas:
S = [ 3(2^n - 1) - 2n ] / 2^n
cius <viniciusmeirelesa@bol.com.br> escreveu:
1) 1/2 + 3/2^+5+ 5/2^3+...+(2n-1)/2^n
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