Dua barisan geometri diantara -10 dan -5/4

jawab

-10, -5.4

a= -10
r = -5/4 : -10
r = 1/8
sisipan s = 2
r ' = (r)^(1/(s+1)
r ' = (1/8)^(1/3)
r' = (2^-3)^(1/3)
r' = 2^-1
r' = 1/2

barisan itu = -10, - 5 , - 5/2 , = 5/4
dua suku itu = -5 dan - 5/2