an= (−1)n×2n−1 5 32895 记等比数列{an}的前n项和为Sn,已知S4=1,S8=17,求{an}通项公式设{an}的公比为q,由S4=1,S8=17知q≠1,所以得a1(q^4-1)/(q-1)=1,①a1(q^8-1)/(q-1)=17.②由①、②式,得q^4+1=17,∴q^4=16.∴...
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完型填空 It was too late at night when an old man came to a small town. He found a small hotel and wanted to stay there for the night. After he 1 his room, the owner said to the wife, "Look at his bag. There must be 2 money in it. Let's