高一等差数列和等比数列1(1)Sn=(-1)^(n+1) ×n 求an(2)Sn=3+2^n 求an2 a1=1 a(n+1)=an+2^n-1 求an3 an+1/an=2Sn 求an
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![高一等差数列和等比数列1(1)Sn=(-1)^(n+1) ×n 求an(2)Sn=3+2^n 求an2 a1=1 a(n+1)=an+2^n-1 求an3 an+1/an=2Sn 求an](/uploads/image/z/8818160-32-0.jpg?t=%E9%AB%98%E4%B8%80%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E5%92%8C%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%971%281%29Sn%3D%28-1%29%EF%BC%BE%28n%2B1%29+%C3%97n+%E6%B1%82an%282%29Sn%3D3%2B2%EF%BC%BEn+%E6%B1%82an2+a1%3D1+a%28n%2B1%29%3Dan%2B2%EF%BC%BEn-1+%E6%B1%82an3+an%2B1%2Fan%3D2Sn+%E6%B1%82an)
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