Question

log0,55 11-log0,55 20

Answer 1

$= log_{ \frac{55}{100} } \frac{11}{20} = log_{ \frac{11}{20} } \frac{11}{20} =1$

Answer 2

$log_{0,55} 11- log_{0,55}20= log_{0,55}11/20= log_{0,55}55/100= log_{0,55}0,55=1$