№3. Сократить дроби a) 12/18 = ; 18/200 = ; 20/24 = ; 24/30 = ; б) 56/49 = ; 40/32 = ; 48/36 = ; 28/21 = ; в) 21/56 = ; 144/120 = ; 156/128 = ; 396/240 = .

Ответ:

a)

• \(\frac{12}{18} = \frac{12:6}{18:6} = \frac{2}{3}\)
• \(\frac{18}{200} = \frac{18:2}{200:2} = \frac{9}{100}\)
• \(\frac{20}{24} = \frac{20:4}{24:4} = \frac{5}{6}\)
• \(\frac{24}{30} = \frac{24:6}{30:6} = \frac{4}{5}\)

б)

• \(\frac{56}{49} = \frac{56:7}{49:7} = \frac{8}{7}\)
• \(\frac{40}{32} = \frac{40:8}{32:8} = \frac{5}{4}\)
• \(\frac{48}{36} = \frac{48:12}{36:12} = \frac{4}{3}\)
• \(\frac{28}{21} = \frac{28:7}{21:7} = \frac{4}{3}\)

в)

• \(\frac{21}{56} = \frac{21:7}{56:7} = \frac{3}{8}\)
• \(\frac{144}{120} = \frac{144:24}{120:24} = \frac{6}{5}\)
• \(\frac{156}{128} = \frac{156:4}{128:4} = \frac{39}{32}\)
• \(\frac{396}{240} = \frac{396:12}{240:12} = \frac{33}{20}\)

Ответ: