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1 11 1 8 Arătați că = şi apoi calculați: n.(n+k) kn n+k, 1 1 1 1 a S= + + +. b S 1.3 3.5 5-7 89.91 1 1 1 1-5 5-9 9.13 1 +... 81-85 1 1 1 1 1 1 1 1 c S= + + + + d S= + + +... + 2.4 4-6 6-8 70-72 1.4 4.7 7.10 88.91 ​

Răspuns :

Răspuns:

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