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an=2^(4-n) a1=2^(4-1)=8 公比是q=2^(-1)=1/2 Sn=a1*(1-q^n)/(1-q)=8*[1-(1/2)^n]/(1-1/2)=16(1-1/2^n) S5=16(1-1/2^5)=31/2 如果不懂,請Hi我,祝學習愉快!
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