1) log3log5 125 2) lg16/lg2 3) 2log5 27 - log5 81 - 2log5 15

1)[latex]3)log_{5} 27^{2}- log_{5}81- log_{5} 15^{2} ;log_{5} \frac{ 3^{6} }{ 3^{4} }= log_{5} 3^{2} - log_{5}15^{2}= log_{5} \frac{9}{225} = -2 [/latex] [latex] log_{3}log_5}125 =log_5 125=3; log_{3} 3=1[/latex] 2)[latex] \frac{ lg_{16} }{ lg_{2} } = log_{2} 16=4[/latex]