July 2021 0 52 Report
3 легких номера на арифметическую прогрессию 1) Дано:
(an) - арифм. прогр.
an - натуральное
an кратно 8
an>50
an<180
Найти: S

2) Дано:
(an) - арифм. прогр.
an=3n-1
Найти: S47

3) Дано:
(an) - арифм. прогр.
Sn=5n^2-3n
Найти: а1 и d
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