一个等比数列的前几项和Sn=a-(½)^n,求a
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一个等比数列的前几项和Sn=a-(½)^n,求a
一个等比数列的前几项和Sn=a-(½)^n,求a
一个等比数列的前几项和Sn=a-(½)^n,求a
s1=a-0.5,n1=a-0.5
s2=a-0.25,n2=0.25
s3=a-0.125,n3=0.125
n3/n2=n2/n1 0.5=0.25/a-0.5
a=1