Помогите пж умоляю !номер 2,3,4

2)
а) $\frac{4}{5} - \frac{1}{3} = \frac{12-5}{15} = \frac{7}{15}$
б) $\frac{3}{4}- \frac{1}{3} = \frac{9-4}{12} = \frac{5}{12}$
в) $\frac{4}{5} - \frac{3}{4} = \frac{16-15}{20} = \frac{1}{20}$
г) $\frac{3}{4} - \frac{4}{9} = \frac{27-16}{36} = \frac{11}{36}$
3)
а) $\frac{9}{14} - \frac{2}{7} = \frac{9-4}{14} = \frac{5}{14}$
б) $\frac{5}{12} - \frac{1}{3} = \frac{5-4}{12} = \frac{1}{12}$
в) $\frac{7}{10} - \frac{2}{5} = \frac{7-4}{10} = \frac{3}{10}$
г) $\frac{17}{100}- \frac{1}{10} = \frac{17-10}{100} = \frac{7}{100}\\4) а)[tex] \frac{7}{12}- \frac{2}{9} = \frac{21-8}{36} = \frac{13}{36}$
б) $\frac{4}{15}- \frac{3}{20} = \frac{16-9}{60} = \frac{7}{60}$
в) $\frac{7}{10} - \frac{4}{15} = \frac{x21-8}{30} = \frac{13}{30}$
г) $\frac{17}{30} - \frac{9}{20} = \frac{34-27}{60} \frac{7}{60}$