Kalau ada yang bisa, tolong dibantu ya, makasih

[tex] \frac{1}{ \sqrt{5} _{log5} } + \frac{1}{ \sqrt{5} _{log25} } + \frac{1}{ \sqrt{5} _{log625} }+ ... + ... = ... [/tex]
[tex] \frac{1}{2} + \frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \frac{1}{32} = ...[/tex][tex] \frac{16 + 8 + 4 +2 + 1}{32} = \frac{31}{32} [/tex]