Предмет: Алгебра, автор: knyazevvitaliy200712

9.13.17 орифмитическая прогрессия найдите S11​

Ответы

Автор ответа: dobra888
0

Ответ:   319 .

Объяснение:

а₁ = 9 ;  а₂ = 13 ,  d = 13 - 9 = 4 ;

a₁₁ = a₁ + 10d = 9 + 10*4 = 49 ;

 S₁₁ ( 9 + 49 )*11/2 = 29 *11 = 319 .

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