inscrevendo nove meios aritméticos entre 15 e 45, qual é o termo PA? .... Pergunta de ideia deamandalive10

amandalive10 @amandalive10

October 2020 1 142 Report

inscrevendo nove meios aritméticos entre 15 e 45, qual é o termo PA?

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RedSeven $a_{n}= a_{1}+(n-1).R$
45=15+(11-1).R ⇒ 9 meios igual a n, mais o primeiro e o ultimo termo igual a 11.
45=15+(11-1).R
45=15+10R
45-15=10R
30=10R
$\frac{30}{10}$ =R
R=3 ⇒ Razão igual a 3.

P.A: (15,18,21,24,27,30,33,36,39,42,45)

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