Question

Insira doze meios aritméticos entre -17 e 35

Answer 1

Resposta:

Encontrar a razão da PA

an = a1 + ( n -1) . r    

35 = -17 + ( 14 -1) . r    

35 = -17 + 13r    

52 = 13r    

r = 4

===

an = a1 + ( n -1) . r an

a1 = -17 + ( 1 -1) .4 = -17

a2 = -17 + ( 2 -1) .4 =-13

a3 = -17 + ( 3 -1) .4 = -9

a4 = -17 + ( 4 -1) .4 = -5

a5 = -17 + ( 5 -1) .4 = -1

a6= -17 + ( 6 -1) .4  =3

a7= -17 + ( 7 -1) .4  =7

a8 = -17 + ( 8 -1) .4 = 11

a9 = -17 + ( 9 -1) .4 = 15

a10 = -17 + ( 10 -1) .4 = 19

a11 = -17 + ( 11 -1) .4  = 23

a12 = -17 + ( 12 -1) .4 = 27

a13 = -17 + ( 13 -1) .4 = 31

a14 = -17 + ( 14 -1) .4 = 35

PA = ( -17 , -13, -9 , -5 , -1 , 3 , 7 , 11 , 15 , 19 , 23 , 27 , 31 , 35 )