Odpowiedzi

2010-01-28T21:05:57+01:00
A3=a1*q^(3-1)=1
a6=a1*q^(6-1)=-8

a1*q^2=1
a1*q^5=8

(a1*q^2)/(a1*q^5)=1/8
(q^2)/(q^5)=1/8

q^(-3)=1/8 |^-1/3
q=(1/8)^(-1/3)
q=1/(pierwiastek[3](1/8))
q=1/(1/2)=2

a1*q^2=1
a1*2^2=1
a1*4=1 |:4
a1=1/4

a8=a1*q^(8-1)
a8=1/4*2^7=1/4*128=32
a8=32

S3=a1*(1-q^3)/(1-q)
S3=1/4*(1-2^3)/(1-2)=1/4*(1-8)/(-1)=1/4*(-7)/(-1)=1/4*7=7/4
S3=1 3/4
1 2 1