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分開看,先看所有的分子:1,2,4,8,…… 這是以1為首項,2為公比的等比數列,通項為:2的(n-1)次幂 再看所有的分母:5,8,11,14,…… 這是以5為首項,3為公差的等差數列,通項為:5+(n-1)*3=3n+2 所以,這個數列的通項公式為:2的(n-1)次幂/(3n+2)
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