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vovavasilev201
@vovavasilev201
July 2022
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Найдите первый положительный член арифмитической прогрессии:-20,2;-18,5;...
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koba80
-20,2. -18,5
a1=-20,2
a2=-18,5
d=a2-a1=-18,5-(-20,2)=-18,5+20,2=1,7
an=a1+d(n-1)
a13=-20,2+1,7(13-1)=-20,2+1,7×12=-20,2+20,4=0,2
ответ:а13=0,2
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Answers & Comments
a1=-20,2
a2=-18,5
d=a2-a1=-18,5-(-20,2)=-18,5+20,2=1,7
an=a1+d(n-1)
a13=-20,2+1,7(13-1)=-20,2+1,7×12=-20,2+20,4=0,2
ответ:а13=0,2