Question

1- Determine e escreva no caderno o valor de
A) 2-1+1/2-...
B) 12-4+4/3-...

Answer 1

Boa tarde

PG

a) 

u1 = 2
u2 = -1
u3 = 1/2
q = u2/u1 = .1/2 

soma infinita
Sn = u1/(1 - q)
Sn = 2/(1 + 1/2)
Sn = 4/3 

b)

u1 = 12
u2 = -4 
u3 = 4/3
q = u2/u1 = -4/12 = -1/3

soma infinita
Sn = u1/(1 - q)
Sn = 12/(1 + 1/3) = 12/(4/3) = 36/4 = 9