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mkarpova305
@mkarpova305
July 2023
1
5
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a1=15;
d=2
Знайти S30
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veronikagorb40
1. Формула для нахождения суммы арифметической прогрессии:
S=(2*a1+d*(n-1))n/2
Подставляем значения:
S30=(2*15+2*29)30/2=1320
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Answers & Comments
S=(2*a1+d*(n-1))n/2
Подставляем значения:
S30=(2*15+2*29)30/2=1320