若无穷等比数列an的首项为a1€N,公比为q,且1/q€N,Sn=a1+a2+…+an,且limSn=3,则a1+a3
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![若无穷等比数列an的首项为a1€N,公比为q,且1/q€N,Sn=a1+a2+…+an,且limSn=3,则a1+a3](/uploads/image/z/14302688-32-8.jpg?t=%E8%8B%A5%E6%97%A0%E7%A9%B7%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97an%E7%9A%84%E9%A6%96%E9%A1%B9%E4%B8%BAa1%26%238364%3BN%2C%E5%85%AC%E6%AF%94%E4%B8%BAq%2C%E4%B8%941%2Fq%26%238364%3BN%2CSn%3Da1%2Ba2%2B%E2%80%A6%2Ban%2C%E4%B8%94limSn%3D3%2C%E5%88%99a1%2Ba3)
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若无穷等比数列an的首项为a1€N,公比为q,且1/q€N,Sn=a1+a2+…+an,且limSn=3,则a1+a3
若无穷等比数列an的首项为a1€N,公比为q,且1/q€N,Sn=a1+a2+…+an,且limSn=3,则a1+a3
若无穷等比数列an的首项为a1€N,公比为q,且1/q€N,Sn=a1+a2+…+an,且limSn=3,则a1+a3
1/q∈N,则0+∞
a1=3(1-q)=3-3q
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