Question

INSIRA 5 MEIOS ARITMÉTICOS ENTRE 1 E 3

Answer 1

a1 = 1
a7 = 3

$a_7=a_1+6.R\\ 3=1+6R\\ 6R=2\\ R=\frac{1}{3}$

Logo a PA(1, 4/3, 5/3, 2, 7/3, 8/3, 3}

Answer 2

$\boxed{a_n = a_1+(n-1)*r}$

$3 = 1+(7-1)*r\\\\ 3 = 1+6r\\\\ 6r = 2\\\\ r = \frac{2}{6}\\\\\ \boxed{r=\frac{1}{3}}$

Os meios são:

$\boxed{(1,\frac{4}{3},\frac{5}{3},2,\frac{7}{3},\frac{8}{3},3)}$