共50条信息
数列\(\{ a_{n}\}\)中,\(a_{1}{=}1{,}a_{n{+}1}{=}2a_{n}{+}2\),则\(a_{7}\)的值为\(({ })\)
已知函数\(f(x)= \dfrac{x}{1+x}(x > 0) \),设\(f(x)\)在点\((n,f(n))(n∈N*)\)处的切线在\(y\)轴上的截距为\({b}_{n} \),数列\(\{{a}_{n}\} \)满足:\({a}_{1}= \dfrac{1}{2} \),\({a}_{n+1}=f({a}_{n}) (n∈N*)\),在数列\(\{ \dfrac{{b}_{n}}{{{a}_{n}}^{2}}+ \dfrac{λ}{{a}_{n}}\} \)中,仅当\(n=5\)时,\( \dfrac{{b}_{n}}{{{a}_{n}}^{2}}+ \dfrac{λ}{{a}_{n}} \)取最小值,则\(λ \)的取值范围是( )
已知数列\(\{{{a}_{n}}\}\)满足递推关系:\({a}_{n+1}= \dfrac{{a}_{n}}{{a}_{n}+1},{a}_{1}= \dfrac{1}{2} \),则\({a}_{2017} =(\) \()\)
已知数列\(\{an\}\)满足\({a}_{1}=2 \) ,\({a}_{n+1}= \dfrac{1+{a}_{n}}{1-{a}_{n}}(n∈{N}^{*}) \) ,则连乘积\({a}_{1}{a}_{2}{a}_{3}……{a}_{2012}{a}_{2013} \) 的值为( )
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