Question

Interpole 7 meios aritméticos entre 12 e 76

Answer 1

(12, ?, ?, ?, ?, ?, ?, ?, 76)

An = 76
A1 = 12
n = 9

An = A1 + (n-1).r
76 = 12 + (9-1).r
76 = 12 + 8r
8r = 76-12
8r = 64
r = 8

Resposta (12, 20, 28, 36, 44, 52, 60, 68, 76)