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dashasivakova12
@dashasivakova12
July 2022
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найти пятый член и сумму двадцати первый членов арифметической прогрессии (an) , если а1=7, d=2
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DedushkaBake
Sn=(2a1+d(n-1))*n/2
S20=(2*7+2*19)*20/2=2(7+19)*10=2*26*10=520
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Answers & Comments
S20=(2*7+2*19)*20/2=2(7+19)*10=2*26*10=520