数列{an}中， a1=5,an=2an−1+an−1(n∈N∗,n≥2) ，若存在实数λ，使得数列 {an+λ2n} 为等差数列，则λ=_1．_刷题宝

题干

数列{a_n}中， a1=5,an=2an−1+an−1(n∈N∗,n≥2) ，若存在实数λ，使得数列 {

a

n

+

λ

2

n

} 为等差数列，则λ=____．

上一题下一题 0.0难度选择题更新时间:2017-09-03 04:06:18

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