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Advanced mathematics, single choice, 3 4 5 questions, what to choose respectively, detailed analysis, thank you very much!
3 The original formula = (1/3) lim [3x/f (3x)] = (1/3) lim [u/f (u)] = 2,
Lim [u/f (u)] = 6, lim [f (2x)/x] = 2 lim [f (2x)/(2x)] = 2 (1/6) =1/3, and choose D.
4. The corresponding positive series also converges, so it is absolutely convergent. Choose C.