Предмет: Алгебра, автор: Vallvall

В арифметической прогрессии (аn) с рознастью d,найдите а13,когда а1=4,d=1,2

Ответы

Автор ответа: TeoremaSin

Аn=a1+d(n-1)
A13=a1+12d
A13=4+12*1,2=4+14,4=18,4

Автор ответа: Astrumbellum

a13=4+1,2*12=4+14,4=18,4

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