Jawabanmu

2014-04-30T11:39:32+07:00
2014-04-30T11:41:37+07:00
U3=18
ar^2 = 18
a = 18 / (r^2)

U6=486
ar^5=486
a = 486 / (r^5)

r^3 = 486/18 = 27
r = 3
a=2
U5=ar^4 = 2.81 =192