职教组卷基于海量职教高考试题库建立的在线组卷及学习系统
职教组卷
  • 题型:解答题 题类:单元测试 难易度:较易

    设数列\(\{a_{n}\}\)是等差数列,数列\(\{b_{n}\}\)是公比大于\(0\)的等比数列,已知\(a_{1}=1\),\(b_{1}=3\),\(b_{2}=3a_{3}\),\(b_{3}=12a_{2}+3.\)
    \((1)\)求数列\(\{a_{n}\}\)和数列\(\{b_{n}\}\)的通项公式;
    \((2)\)设数列\(\{c_{n}\}\)满足\(c_{n}=\begin{cases}{1,n\leqslant 5}\\ {b_{n-5},n\geqslant 6}\end{cases}\),求数列\(\{a_{n}c_{n}\}\)的前\(n\)项和\(T_{n}.\)
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