Jawabanmu

Jawaban paling cerdas!
2014-03-26T18:15:27+07:00
U1 = a = 4
U2 = b 
U3 = c = 25

sifat deret geometri:
 a.c = b²
4.25 = b²
100 = b²
b = 10

k = 4 + 10 + 25 = 39
1 5 1