在数列{an}中,a1=2,a(n+1)=2an+2^(n+1),n∈N+,1)求数列{an}的通项公式2)求数列{an}的前n项和Sn3)证明存在k∈N+,使得a(n+1)/an
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![在数列{an}中,a1=2,a(n+1)=2an+2^(n+1),n∈N+,1)求数列{an}的通项公式2)求数列{an}的前n项和Sn3)证明存在k∈N+,使得a(n+1)/an](/uploads/image/z/5616712-64-2.jpg?t=%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D2%2Ca%EF%BC%88n%2B1%EF%BC%89%3D2an%2B2%5E%EF%BC%88n%2B1%EF%BC%89%2Cn%E2%88%88N%2B%2C1%29%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F2%29%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn3%29%E8%AF%81%E6%98%8E%E5%AD%98%E5%9C%A8k%E2%88%88N%2B%2C%E4%BD%BF%E5%BE%97a%28n%2B1%29%2Fan)
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