优优班--学霸训练营 > 题目详情
  • 已知数列\(\{a_{n}\}\)与\(\{b_{n}\}\)满足\(a_{n+1}-a_{n}=2(b_{n+1}-b_{n})\),\(n∈N^{*}\).
    \((1)\)若\(b_{n}=3n+5\),且\(a_{1}=1\),求\(\{a_{n}\}\)的通项公式;
    \((2)\)设\(\{a_{n}\}\)的第\(n_{0}\)项是最大项,即\(a_{n\_{0}}\geqslant a_{n}(n∈N*)\),求证:\(\{b_{n}\}\)的第\(n_{0}\)项是最大项;
    \((3)\)设\(a_{1}=3λ < 0\),\(b_{n}=λ^{n}(n∈N^{*})\),求\(λ\)的取值范围,使得对任意\(m\),\(n∈N^{*}\),\(a_{n}\neq 0\),且\( \dfrac {a_{m}}{a_{n}}∈( \dfrac {1}{6},6)\).
    【考点】数列的递推关系,数列的函数特征
    【分析】请登陆后查看
    【解答】请登陆后查看
    难度:中等
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