log RS= log R + log S log (R/S) = log R - log S log R^t = t log R log a a=1 ( ∵ a 1 =a ) log a 1=0 ( ∵ a 0 =1 ) log a R= (log b R) / ( log b a )
2025/1/11
2025/1/8
2025/1/1
2024/12/15
2024/12/11