od Daniel » Utorak, 10. Mart 2015, 08:03
Ja sam to uradio neznatno drugačije:
[dispmath]\frac{\log_530}{\log_{150}5}-\frac{\log_5750}{\log_65}=\\
=\log_530\cdot\log_5150-\log_5750\cdot\log_56=\\
=\log_5\left(5\cdot6\right)\cdot\log_5150-\log_5\left(5\cdot150\right)\cdot\log_56=\\
=\left(\cancelto{1}{\log_55}+\log_56\right)\cdot\log_5150-\left(\cancelto{1}{\log_55}+\log_5150\right)\cdot\log_56=\\
=\log_5150+\cancel{\log_56\log_5150}-\log_56-\cancel{\log_56\log_5150}=\\
=\log_5\frac{150}{6}=\log_525=2[/dispmath]
I do not fear death. I had been dead for billions and billions of years before I was born, and had not suffered the slightest inconvenience from it. – Mark Twain