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slobarrr
@slobarrr
July 2022
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знайти суму членів арифметичної прогресії якщо а1=2,d=3 n=7
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Lesben
Verified answer
A1=2,d=3,n=7, s7=?
a7=a1+6d, a7=2+6.3=2+18=20
sn=n(a1+an)/2
s7=7(a1+a7)/2
s7=7(2+20)/2=7.22/2=7.11=77
Otvet: s7=77
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Verified answer
A1=2,d=3,n=7, s7=?a7=a1+6d, a7=2+6.3=2+18=20
sn=n(a1+an)/2
s7=7(a1+a7)/2
s7=7(2+20)/2=7.22/2=7.11=77
Otvet: s7=77