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2+2+2的平方+2的立方+2的四次方+.+2的2006次方=2+(2+2的平方+2的立方+2的四次方+.+2的2006次方)括弧裏就是個a1=2,q=2,n=2006的等比數列,這題就好做了利用等比數列求和公式Sn=a1(1-q^n)/(1-q)=2+(2*(1-2^2006)/(1…
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