Answers

2016-07-12T15:56:40+08:00
-2,-4,-8,-16,-32,-64    r= 2
256,-128,64,-32,16    r= 1/2
27,9,3,1,1/3               r= 1/3
1/4,1,4,16,64,256       r= 4
5x2, 5x4, 5x6, 5x8 5x10    r= x2
2 3 2