數學證明題！越簡短越好！
回答 (1)
2007-11-17 5:52 am
✔ 最佳答案
LHS = 2+2^2+2^3+...+2^n=2[2^n - 1]/(2-1) [**Sum of geometric sequence]
= 2^(n+ 1) - 2
< 2^(n+1)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071116000051KK03807