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AnechkaEss
@AnechkaEss
July 2022
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в арифметической прогрессии a8=-24,1 ; a18=-39,1. Найдите разность прогрессии
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uekmyfhfp
Сначала формула an= a1 + d*(n-1);
а8= a1 + 7d;
a18= a1 +17 d;
a18-a8=a1 + 17d -(a1+7d)=a1+17d-a1- 7d=10d;
-39,1 -(- 24,1) = 10 d;
10 d = -39,1 +24,1 ;
10 d = - 15 ;
d= -15/10 ;
d= -1,5
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Answers & Comments
а8= a1 + 7d;
a18= a1 +17 d;
a18-a8=a1 + 17d -(a1+7d)=a1+17d-a1- 7d=10d;
-39,1 -(- 24,1) = 10 d;
10 d = -39,1 +24,1 ;
10 d = - 15 ;
d= -15/10 ;
d= -1,5