Аn=-5,3-4,5n Найти: S12...

zagulovaregina @zagulovaregina

July 2022 1 8 Report

Аn=-5,3-4,5n
Найти: S12

Answers & Comments

dtnth

Verified answer

$a_n=-5.3-4.5n$
$a_1=-5.3-4.5*1=-9.8$
$a_{12}=-5.3-4.5*12=-59.3$
$S_n=\frac{a_1+a_n}{2}*n$
$S_{12}=\frac{-9.8+(-59.3)}{2}*12=-414,6$

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