Ответ:\(\frac{12}{20}=\frac{12:4}{20:4}=\frac{3}{5}\).\(\frac{18}{24}=\frac{18:6}{24:6}=\frac{3}{4}\).\(0{,}55=\frac{55}{100}=\frac{55:5}{100:5}=\frac{11}{20}\).\(0{,}82=\frac{82}{100}=\frac{82:2}{100:2}=\frac{41}{50}\).