设{an}是公比大于1的等比数列,a₁+a₂+a₃=7,且a₁+3,3a₂,a₃+4构成等差数列(1)求数列an的通项公式(2)令bn=lna(3n+1)(n为正整数),求bn的通项公式
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![设{an}是公比大于1的等比数列,a₁+a₂+a₃=7,且a₁+3,3a₂,a₃+4构成等差数列(1)求数列an的通项公式(2)令bn=lna(3n+1)(n为正整数),求bn的通项公式](/uploads/image/z/6970028-68-8.jpg?t=%E8%AE%BE%7Ban%7D%E6%98%AF%E5%85%AC%E6%AF%94%E5%A4%A7%E4%BA%8E1%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2Ca%26%238321%3B%2Ba%26%238322%3B%2Ba%26%238323%3B%EF%BC%9D7%2C%E4%B8%94a%26%238321%3B%2B3%2C3a%26%238322%3B%2Ca%26%238323%3B%2B4%E6%9E%84%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97an%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%882%EF%BC%89%E4%BB%A4bn%3Dlna%283n%2B1%29%EF%BC%88n%E4%B8%BA%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89%2C%E6%B1%82bn%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F)
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