Предмет: Алгебра, автор: nastal1999

Дана арифметическая прогрессия an вычислите сумму 8 членов, если а11=47,d=3. Срочно, пожалуйста:))

Ответы

Автор ответа: eVa74

a11=a1+10d
a1+30=47
a1=17
S8=(2*a1+7d)*8/2
S8=(2*17+21)*4=220

nastal1999: Спасибо огромное:)

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