Предмет: Алгебра, автор: albinachernova080920

Найдите сумму первых тридцати членов арифметической прогрессии, в которой x1=5 , x30=15.

Ответы

Автор ответа: fenix6810

Ответ:

300

Объяснение:

S=(a1+an)n/2

S=(5+15)*30/2=20*30/2=300

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