Question

Me ajudem Por favor

Answer 1

Dada a PG (320, 160, 80, ...), temos:

a1 = 320
q = 160/320 = 1/2

Sn = a1.(q^n - 1)/(q - 1)
S8 = 320.[(1/2)^8 - 1]/(1/2 - 1)
S8 = 320.(1/256 - 1)/(- 1/2)
S8 = (320/256 - 320).(- 2)
S8 = (1,25 - 320).(- 2)
S8 = (- 318,75).(- 2)
S8 = 637,5.

Answer 2

Dada a PG (320, 160, 80, ...), temos:

a1 = 320
q = 160/320 = 1/2

Sn = a1.(q^n - 1)/(q - 1)
S8 = 320.[(1/2)^8 - 1]/(1/2 - 1)
S8 = 320.(1/256 - 1)/(- 1/2)
S8 = (320/256 - 320).(- 2)
S8 = (1,25 - 320).(- 2)
S8 = (- 318,75).(- 2)
S8 = 637,5.