tentukan rasio barisan geometri berikut . a.1,2,4,8 b.5,10,45,135,... c.20,10,5,... d.1per12,1per4,9per4,... e.7,7per

A. 2
B. 3 (kykny 10salah yg benar 15)
C. - 2
D. Kurang tau
E. 1/2

1.
[tex] = r = \frac{u2}{u1} = \frac{4}{2} = 2 [/tex]
caranya sama
2.
[tex] \frac{10}{5} = 2[/tex]
3
[tex] \frac{10}{20} = \frac{1}{2} = 0.5[/tex]
4.
[tex] \frac{ \frac{1}{14} }{ \frac{1}{12} } \\ = \frac{1}{4} \times \frac{12}{1} = 3[/tex]

5.
[tex] \frac{7}{4} \times \frac{2}{ \frac{77}{10} } = \frac{7}{4} \times \frac{20}{7} = 5[/tex]