1.设数列{an}是等差数列,an≠0.求1/a1a2+1/a2a3+...+1/a(n-1)anps:1/a1a2+1/a2a3+...+1/a(n-1)an中的(n-1)实际写出来是比a小的哦,不是a乘以n-1哦.2.设数列{an}满足a1+3a*2+3^2*(a3)+...+3^n-1*(an)=n/3,a∈正整数1)求数列{an}
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![1.设数列{an}是等差数列,an≠0.求1/a1a2+1/a2a3+...+1/a(n-1)anps:1/a1a2+1/a2a3+...+1/a(n-1)an中的(n-1)实际写出来是比a小的哦,不是a乘以n-1哦.2.设数列{an}满足a1+3a*2+3^2*(a3)+...+3^n-1*(an)=n/3,a∈正整数1)求数列{an}](/uploads/image/z/693619-43-9.jpg?t=1.%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2Can%E2%89%A00.%E6%B1%821%2Fa1a2%2B1%2Fa2a3%2B...%2B1%2Fa%28n-1%29anps%3A1%2Fa1a2%2B1%2Fa2a3%2B...%2B1%2Fa%28n-1%29an%E4%B8%AD%E7%9A%84%28n-1%29%E5%AE%9E%E9%99%85%E5%86%99%E5%87%BA%E6%9D%A5%E6%98%AF%E6%AF%94a%E5%B0%8F%E7%9A%84%E5%93%A6%2C%E4%B8%8D%E6%98%AFa%E4%B9%98%E4%BB%A5n-1%E5%93%A6.2.%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3a1%2B3a%2A2%2B3%5E2%2A%28a3%29%2B...%2B3%5En-1%2A%28an%29%3Dn%2F3%2Ca%E2%88%88%E6%AD%A3%E6%95%B4%E6%95%B01%29%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D)
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