2. Выполните вычитание 3/5 - 4/7 = 8/21 - 4/35 = 1/2 - 1/3 = 11/63 - 5/42 =

Решение:

• \[ \frac{3}{5} - \frac{4}{7} = \frac{21}{35} - \frac{20}{35} = \frac{1}{35} \]
• \[ \frac{8}{21} - \frac{4}{35} = \frac{40}{105} - \frac{12}{105} = \frac{28}{105} = \frac{4}{15} \]
• \[ \frac{1}{2} - \frac{1}{3} = \frac{3}{6} - \frac{2}{6} = \frac{1}{6} \]
• \[ \frac{11}{63} - \frac{5}{42} = \frac{22}{126} - \frac{15}{126} = \frac{7}{126} = \frac{1}{18} \]

Ответ: 1) 1/35; 2) 4/15; 3) 1/6; 4) 1/18