Zjednoduš výraz log \( 12+\log 5-\log 4 \) na jeden logaritmus.
\( =\log \left(\frac{5}{4}\right)=\log (5 \cdot 4)=\log 20 \)
\( =\log \left(\frac{3 \cdot 5}{1}\right)=\log (3 \cdot 5)=\log 15 \)
\( =\log \left(\frac{12}{4}\right)=\log (3 \cdot 4)=\log 12 \)
\( =\log \left(\frac{12 \cdot 5}{4}\right)=\log (12 \cdot 5)=\log 60 \)
