Jawabanmu

2014-02-20T20:32:45+07:00
Un=a+(n-1)b hasilnya 540
tolong pake caranya saya kurang mengerti
2014-02-20T20:46:11+07:00
a = 108 \\ r = \frac{U_2}{U_1} = \frac{36}{108} = \frac{1}{3} \\ U_{10} = ar^{n - 1} = 108(\frac{1}{3})^{10 - 1} = (3^3)(2^2)(3^{-9}) = (3^{-6})(2^2) = \frac{4}{729}
hasl'a 4/729 dari mana ?
dari 3^-6 x 2^2
3^-6 = 1/729
dari 3^-6 x 2^2
3^-6 = 1/729
Serta 108 = 3^3 x 2^2