已知数列{a n }中,a 1 = ,点(n,2a n+1 -a n )在直线y=x上,其中n=1,2,3,… (Ⅰ)令b n =a n-1 -a n -1,求证数列{b n }是等比数列; (Ⅱ)求数列{a n }的通项; (Ⅲ)设S n 、T n 分别为数列{a n }、{b n }的前n项和,是否存在实数λ,使得数列 为等差数列?若存在,试求出λ;若不存在,则说明理由。
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举一反三
【单选题】The writer of Advice 1 is trying to tell the blogger that______.
A.
don't try to take a short sleep after the alarm goes off
B.
after the alarm goes off, he should wake up gradually
C.
the alarm may slow down his productivity and energy