Oblicz: b) log 8+ log 125 e) [latex] log_{7} [/latex] 19- [latex] log_{7} [/latex] [latex]frac{19}{49}[/latex] g) [latex]log_{5} [/latex] 0,04 - [latex]log_{5} 0,008[/latex] h) log 6 - log 2 - log 3

[latex]log8+log125=log1000=3[/latex] e) [latex]log_719-log_7{frac{19}{49}}=log_7(19:frac{19}{49})=log_749=2[/latex] g) [latex]log_50,04-log_50,008=log_5frac{0,04}{0,008}=log_55=1[/latex] h) [latex]log6-log2-log3=log(6:2:3)=log1=0[/latex]

[latex]b) log8+log125=log(8cdot125)=log1000=log10^3=3log10=3\ e) log_719-log_7frac{19}{49}=log_7frac{19}{frac{19}{49}}=log_749=log_77^2=2log_77=2\ g) log_50,04-log_50,008=log_5frac{0,04}{0,008}=log_55=1\ h) log6-log2-log3=logfrac62-log3=log3-log3=0[/latex]