设数列(An)的前N项和为Sn,已知Sn=2An-2的n次方.(1)设(Bn)=an/2的n次方-1,证明(Bn)为等差,(2)设(Cn)=An-n2的N次方-1.证明(Cn)为等比.题打错了,不好意思,应该是:(1)设(Bn)=an/2的n-1次方,证明
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![设数列(An)的前N项和为Sn,已知Sn=2An-2的n次方.(1)设(Bn)=an/2的n次方-1,证明(Bn)为等差,(2)设(Cn)=An-n2的N次方-1.证明(Cn)为等比.题打错了,不好意思,应该是:(1)设(Bn)=an/2的n-1次方,证明](/uploads/image/z/3807767-47-7.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%28An%29%E7%9A%84%E5%89%8DN%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E5%B7%B2%E7%9F%A5Sn%3D2An-2%E7%9A%84n%E6%AC%A1%E6%96%B9.%EF%BC%881%EF%BC%89%E8%AE%BE%28Bn%29%3Dan%2F2%E7%9A%84n%E6%AC%A1%E6%96%B9-1%2C%E8%AF%81%E6%98%8E%28Bn%29%E4%B8%BA%E7%AD%89%E5%B7%AE%2C%EF%BC%882%EF%BC%89%E8%AE%BE%EF%BC%88Cn%EF%BC%89%3DAn-n2%E7%9A%84N%E6%AC%A1%E6%96%B9-1.%E8%AF%81%E6%98%8E%EF%BC%88Cn%EF%BC%89%E4%B8%BA%E7%AD%89%E6%AF%94.%E9%A2%98%E6%89%93%E9%94%99%E4%BA%86%EF%BC%8C%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D%EF%BC%8C%E5%BA%94%E8%AF%A5%E6%98%AF%EF%BC%9A%EF%BC%881%EF%BC%89%E8%AE%BE%28Bn%29%3Dan%2F2%E7%9A%84n-1%E6%AC%A1%E6%96%B9%2C%E8%AF%81%E6%98%8E)
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