Jawabanmu

2014-02-13T16:33:57+07:00
5+10=15 heuiqkjjajjskakkqoiiqq
salah jawaban'a aq tw
ya maaf q masih klas 1
2014-02-13T17:18:56+07:00
U3 = ar² = 18
U6 = ar^5 = 486

 \frac{ ar^{5} }{ ar^{2} } =  \frac{486}{18}
a-nya mati
r³ = 27
r = ∛27 = 3

substitusi r ke ar² = 18
a.3² = 18
a.9 = 18
a = 18/9 = 2