Question

interpolar 10 meios aritméticos entre 6 e -27

Answer 1

6,-,-,-,-,-,-,-,-,-,-,-27

an= a1+(n-1)r       an= -27
                             al=6
                             n=12

-27= 6+(12-1)r
-27= 6+11r
-27-6=11r
11r=--33
r=-33:11
r= -3
sp ir somando ao Al e  obter os 10 termos

PA=(  6,  3,0,-3,-6,-9,-12,-15,-18,-21,-24, -27)

Answer 2

resolução!

an = a1 + ( n - 1 ) r

- 27 = 6 + ( 12 - 1 ) r

- 27 = 6 + 11r

- 27 - 6 = 11r

- 33 = 11r

r = - 33 / 11

r = - 3

PA = { 6 , 3 , 0 , - 3 , - 6 , - 9 , - 12 , - 15 , - 18 , - 21 , - 24 , - 27 }