Номер 273 плиз помогите

1) $\frac{5}{11} + \frac{3}{11} = \frac{8}{11}$

2) $\frac{7}{15} - \frac{4}{15} = \frac{3}{15}$

3) $6+ \frac{5}{13} = 6 \frac{5}{13}$

4) $2 \frac{4}{13} +5 \frac{2}{13} =7 \frac{6}{13}$

5) $4 \frac{11}{18} - 1 \frac{5}{18} =3 \frac{6}{18} =3 \frac{1}{3}$

6) $7 \frac{2}{9} -2 \frac{5}{9} = \frac{65}{9} - \frac{23}{9} = \frac{42}{9} =4 \frac{6}{9} = 4\frac{2}{3}$