几道关于等比数列前N项之和的题目求教~1.数列1,1/2,1/(2^2),···,1/(2^N-1)的各项之和为 ()A.2 - 1/(2^n-1) B.1-1/(2^n) C.1+1/(2^n+1) D.2+1/(2^n+1)2.数列{an}满足an=2^na(n属于N*,a是常数).(1) 判
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/19 07:53:18
![几道关于等比数列前N项之和的题目求教~1.数列1,1/2,1/(2^2),···,1/(2^N-1)的各项之和为 ()A.2 - 1/(2^n-1) B.1-1/(2^n) C.1+1/(2^n+1) D.2+1/(2^n+1)2.数列{an}满足an=2^na(n属于N*,a是常数).(1) 判](/uploads/image/z/11040332-68-2.jpg?t=%E5%87%A0%E9%81%93%E5%85%B3%E4%BA%8E%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E5%89%8DN%E9%A1%B9%E4%B9%8B%E5%92%8C%E7%9A%84%E9%A2%98%E7%9B%AE%E6%B1%82%E6%95%99%7E1.%E6%95%B0%E5%88%971%2C1%2F2%2C1%2F%EF%BC%882%5E2%EF%BC%89%2C%C2%B7%C2%B7%C2%B7%2C1%2F%EF%BC%882%5EN-1%EF%BC%89%E7%9A%84%E5%90%84%E9%A1%B9%E4%B9%8B%E5%92%8C%E4%B8%BA+%EF%BC%88%EF%BC%89A.2+-+1%2F%EF%BC%882%5En-1%EF%BC%89+B.1-1%2F%282%5En%29+C.1%2B1%2F%EF%BC%882%5En%2B1%EF%BC%89+D.2%2B1%2F%282%5En%2B1%292.%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E6%BB%A1%E8%B6%B3an%3D2%5Ena%28n%E5%B1%9E%E4%BA%8EN%2A%2Ca%E6%98%AF%E5%B8%B8%E6%95%B0%29.%EF%BC%881%EF%BC%89+%E5%88%A4)
xV[oG+ڎu4٠£TcCҖPUjK@BBnE$BR'tg]c"AKT*k\93SwO?7lp u~\j,۽3X\ ^ VҽɎ?I 7>
64hKQ->O$1tǴ#) = M
Qm/2wo{)\nx\jM`:`K!īw{
'V8>#<͊_/'/X82ű~L5vڜU|iU+";7)k$M0&a1&d4(1rDd2`"|[pro?$TNUڣZlܸ'6{aFlҭa[a F#ܘ}x̵u}@34Ti$uC R4oaо4["8ç!NxTTDA$:,>XuSr۷\lQ?_["SA4:Щ)=;q_G