各位大虾 请问一下数列里的构造法怎么做啊?、就如这道题 a1=1,an+1(角标)=3an+2(大) 求它的通项公式老师做的是an+1(角标)+1(大)=3(an+1) 首项为2 公比为3的等比 请问这里的首项和公
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![各位大虾 请问一下数列里的构造法怎么做啊?、就如这道题 a1=1,an+1(角标)=3an+2(大) 求它的通项公式老师做的是an+1(角标)+1(大)=3(an+1) 首项为2 公比为3的等比 请问这里的首项和公](/uploads/image/z/5423185-1-5.jpg?t=%E5%90%84%E4%BD%8D%E5%A4%A7%E8%99%BE+%E8%AF%B7%E9%97%AE%E4%B8%80%E4%B8%8B%E6%95%B0%E5%88%97%E9%87%8C%E7%9A%84%E6%9E%84%E9%80%A0%E6%B3%95%E6%80%8E%E4%B9%88%E5%81%9A%E5%95%8A%3F%E3%80%81%E5%B0%B1%E5%A6%82%E8%BF%99%E9%81%93%E9%A2%98+a1%3D1%2Can%2B1%EF%BC%88%E8%A7%92%E6%A0%87%EF%BC%89%3D3an%2B2%EF%BC%88%E5%A4%A7%EF%BC%89++%E6%B1%82%E5%AE%83%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E8%80%81%E5%B8%88%E5%81%9A%E7%9A%84%E6%98%AFan%2B1%EF%BC%88%E8%A7%92%E6%A0%87%EF%BC%89%2B1%28%E5%A4%A7%EF%BC%89%3D3%EF%BC%88an%2B1%EF%BC%89+%E9%A6%96%E9%A1%B9%E4%B8%BA2+%E5%85%AC%E6%AF%94%E4%B8%BA3%E7%9A%84%E7%AD%89%E6%AF%94+%E8%AF%B7%E9%97%AE%E8%BF%99%E9%87%8C%E7%9A%84%E9%A6%96%E9%A1%B9%E5%92%8C%E5%85%AC)
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