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Anastasia29ru
@Anastasia29ru
July 2022
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Помогите, пожалуйста!!! (an)- арифметическая прогрессия, a8=2. Найдите a3+a5+a11+a13.
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lidusya13
А8=а1+7d;
2=a1+7d;
A3=a1+2d;
A5=a1+4d;
A11=a1+10d;
A13=a1+12d;
a1+2d+a1+4d+a1+10d+a1+12d=(a1+7d)•4=2•4=8
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Answers & Comments
2=a1+7d;
A3=a1+2d;
A5=a1+4d;
A11=a1+10d;
A13=a1+12d;
a1+2d+a1+4d+a1+10d+a1+12d=(a1+7d)•4=2•4=8