Предмет: Алгебра, автор: iraaremcuk118

Знайти 20-й член арифметичної прогресії якщо а1 =39 , d=7
Дуже потрібно до завтра

Ответы

Автор ответа: Аноним

0

$a_{20}=a_1+d(20-1)=a_1+19d=39+19*7=39+133=172$

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