Question

interpole oito meios aritméticos entre -1 e 26

Answer 1

P.A.(-1;2;5;8;11;14;17;20;23;26)

a 1 = -1
a 10 = 26
a 10 = a1 + (n - 1 ).r
a 10 = -1 + (10 - 1).r
a 10 = -1 + 9 r
26 + 1 = 9 r
27 = 9 r
27/9 = r
r = 3
a 2 = -1 + 3 ⇒2
a 3 = 2 +3 ⇒5
a 4 = 5 + 3 ⇒8
a 5 = 8 + 3 ⇒11
a 6 = 11 + 3 ⇒14
a 7 = 14 + 3 ⇒17
a 8 = 17 + 3 ⇒20
a 9 = 20 + 3 ⇒23
a 10 = 23 + 3  ⇒26