Предмет: Математика, автор: makcim4ik

Знайдіть суму двадцяти перших членів арифмитичних прогресії а ених якщо а=-16 d=6

Ответы

Автор ответа: GodzillAMC

0

|-16|+6=22
22/4=5.5 шаг прогресии
-16+19*5,5=88,5 - двацатый член
(88,5-16):2*20=725
Ответ: 725

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