Предмет: Алгебра, автор: bojkokiril7

7. Знайдіть десятий член та суму десяти перших членів арифметичноï прогресії (аn), якщо а1 = 15, d=-3.

Ответы

Автор ответа: dyexfnf

1

Ответ:

Объяснение:

а10 = а1 + 9d = 15 + 9( -3) = 15 - 27 = -12

S10 = (2a1 + 9d)/2)) * 10 = (2 * 15 - 9(-3)/2)) * 10 = 57/2 * 10 = 285

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