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a2*a(n-1)=a1*an=64 又a1+an=34 可得a1=2,an=32或a1=32 an=2 第一種時,Sn=a1(1-q^n)/(1-q)=(a1-q*an)/(1-q)=(2-32q)/(1-q)=62 得q=2 此時,n=5 第二種,同理可得q=1/2,n=5
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