Question

Insira doze meios aritméticos entre 60 e -5?

Answer 1

An = A1 + (n-1).r
A14 = 60 + (14-1).r
-5 = 60 + 13r
-5-60 = 13r
-65 = 13r
r = -65/13
r = -5

(60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, -5)

Answer 2

An = a₁ + (n - 1) * r

- 5 = 60 + (14 - 1) * r

- 5 = 60 + 13r

13r = - 5 - 60

13r = - 65

r = - 65/13

r = - 5

P.A. (60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, - 5).