Jawabanmu

2014-06-04T21:03:57+07:00
U3 = 2
ar² = 2

U8 = 1/16
ar^7 = 1/16
ar² . r^5 = 1/16
2 . r^5 = 1/16
r^5 = 1/2^5
r = 1/2