a1=6,4 d=0,8 S9=?арифметическая прогрессия...

KarinaAbisheva1 @KarinaAbisheva1

August 2022 1 7 Report

a1=6,4 d=0,8 S9=?
арифметическая прогрессия

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inblu

Verified answer

$a_1=6.4 \\ d=0.8 \\ n=9 \\ S_n=\frac{a_1+a_n}{2}*n= \frac{a_1+a_1+(n-1)*d}{2}*n=\frac{2a_1+(n-1)*d}{2}*n \\ S_9=\frac{2*6.4+(9-1)*0.8}{2}*9=(6.4+4*0.8)*9=86.4$

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