Даны члены арифметической прогрессии a3=3,49 и a4=12,58. Вычисли разность прогрессии d=. Created by LisyonokNaKnopke. algebra-ru

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Даны члены арифметической прогрессии a3=3,49 и a4=12,58. Вычисли разность прогре...

LisyonokNaKnopke @LisyonokNaKnopke

August 2022 1 7 Report

Даны члены арифметической прогрессии a3=3,49 и a4=12,58.
Вычисли разность прогрессии d=

Answers & Comments

2407Alexa

Verified answer

An=a1+(n-1)×d
n=3; n=4
a3=3,49
a4=12,58
d=?

{a1+(3-1)×d=3,49
{a1+(4-1)×d=12,58
{a1+2d=3,49
{a1+3d=12,58

a1+2d-a1-3d=3,49-12,58
-d=-9,09|×(-1)
d=9,09.

a1=a3-(n-1)×d
a1=3,49-2×9,09
a1=3,49-18,18
a1=-14,69

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