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nastal1999
@nastal1999
July 2022
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Дана арифметическая прогрессия an вычислите сумму 8 членов, если а11=47,d=3. Срочно, пожалуйста:))
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eVa74
A11=a1+10d
a1+30=47
a1=17
S8=(2*a1+7d)*8/2
S8=(2*17+21)*4=220
3 votes
Thanks 2
nastal1999
Спасибо огромное:)
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Answers & Comments
a1+30=47
a1=17
S8=(2*a1+7d)*8/2
S8=(2*17+21)*4=220