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
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