Номер 508. помогите пожалуйста

1) $\frac{3}{12} + \frac{25}{30} = \frac{1}{4} + \frac{5}{6} = \frac{3}{12} + \frac{10}{12} = \frac{13}{12} =1 \frac{1}{12}$
2) $\frac{10}{24} - \frac{21}{54} = \frac{5}{12} - \frac{7}{18} = \frac{15}{36} - \frac{14}{36} = \frac{1}{36}$
3) $\frac{30}{54} + \frac{22}{30} = \frac{10}{18} + \frac{11}{15} = \frac{50}{90} + \frac{66}{90} = \frac{116}{90} = 1 \frac{26}{90} =1 \frac{13}{45}$
4) $\frac{28}{40} - \frac{10}{75} = \frac{7}{10} - \frac{2}{15} = \frac{21}{30} - \frac{4}{30} = \frac{17}{30}$
5) $\frac{12}{27} + \frac{14}{21} = \frac{4}{9} + \frac{2}{3} = \frac{4}{9} + \frac{6}{9} = \frac{10}{9} = 1 \frac{1}{9}$
6) $\frac{14}{24} - \frac{15}{40} = \frac{7}{12} - \frac{3}{8} = \frac{14}{24} - \frac{9}{24} = \frac{5}{24}$
7) $\frac{12}{18} - \frac{5}{60} = \frac{4}{6} - \frac{1}{12} = \frac{8}{12} - \frac{1}{12} = \frac{7}{12}$
8) $\frac{4}{24} + \frac{3}{36} = \frac{1}{6} + \frac{1}{12} = \frac{2}{12} + \frac{1}{12} = \frac{3}{12} = \frac{1}{4} = 0,25$