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a1a3=a2^2 a1a2a3=8 a2=2 a1+a2+a3=7 a1+a3=5 a1*a3=4 a1=1 a3=4 q=2 a1=4 a3=1 q=1/2(舍) Sn=a1(1-q^n)/(1-q) =2^n-1
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