ln(1/2)=ln((0.989)/(25))x

解

ln (\frac{1}{2}) = ln (\frac{0.989}{25}) x

x = - \frac{ln ( 2 )}{ln ( \frac{0.989}{25} )}

十進法表記

x = 0.21460 \dots

解答ステップ

ln (\frac{1}{2}) = ln (\frac{0.989}{25}) x

辺を交換する

ln (\frac{0.989}{25}) x = ln (\frac{1}{2})

以下で両辺を割る

ln (\frac{0.989}{25})

x = - \frac{ln ( 2 )}{ln ( \frac{0.989}{25} )}