Odpowiedzi

2010-01-02T21:22:30+01:00
A1 * q=4
a1 * q⁴= -32

a1=4/q
(4/q)* q⁴= -32

4*q³ = -32
q³= -32/4
q³= -8
q=-2

a1=4/(-2)
a1= -2

S9=[-2(1- (-2)⁹] / [1- (-2)]
S= [-2 + 2*(-2)⁹] / 3
S= [-2 + 2*(-512)] /3
S=-342
45 4 45