December 2018 1 9 Report
Wykaż bez kalkulatora, że:


b) 1/21 + 1/22 + 1/23 + ... + 1/30 > 1/3

c) 1/11 + 1/12 + 1/13 + ... + 1/40 > 1

a) 1/11 + 1/12 + 1/13 + ... + 1/20 > 1/2

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