7/2+7/4; 19/11+19/8; 1+5/2; 28/13-7/3; 30/7-20/3;помогите пожалуйста решать

Решите задачу:

$\frac{7}{2} + \frac{7}{4} = \frac{14}{4} + \frac{7}{14} = \frac{21}{14} = 1 \frac{7}{14} = \\ = 1 \frac{1}{2}$

$\frac{19}{11} + \frac{19}{8} = 1 \frac{8}{11} + 2 \frac{3}{8} = \\ 1 \frac{64}{88} + 2 \frac{33}{88} = 3 \frac{97}{88} = 4 \frac{9}{88}$

$1 + \frac{5}{2} = 1 + 2 \frac{1}{2} = 3 \frac{1}{2}$

$\frac{28}{13} - \frac{7}{3} = 2 \frac{2}{13} - 2 \frac{1}{3} = \\ 2 \frac{6}{39} - 2 \frac{13}{39} = - \frac{7}{39}$

$\frac{30}{7} - \frac{20}{3} = 4 \frac{2}{7} - 6 \frac{2}{3} = \\ 4 \frac{6}{21} - 6 \frac{14}{21} = - \frac{8}{21}$

7/2+7/4; 19/11+19/8; 1+5/2; 28/13-7/3; 30/7-20/3;помогите пожалуйста решать ​