To be calculated the sum of the first 5 terms... |
Proposed by
Gabi |
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| (0 comments) | 1.906 times displayed |
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... termeni ai unei progresii aritmetice (an)n>=1 stiind ca:
a1 = 1
si
a2 = 3 |
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Ratia este r = a2 - a1 = 2
a5 = a1 + 4r = 1 + 4 * 2 = 9
S5 = 5 ( a1 + a5 ) / 2 = 5 (1 + 9) / 2 = 25 |
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