решите 37/48:5 2/7 - 19/42 * 7/8 + 4 1/5

$\frac{37}{48} :5 \frac{2}{7} - \frac{19}{42} * \frac{7}{8} +4 \frac{1}{5}=3 \frac{19}{20}$
1) $\frac{37}{48} :5 \frac{2}{7} = \frac{37}{48} : \frac{37}{7} = \frac{37}{48} * \frac{7}{37}= \frac{7}{48}$
2) $\frac{19}{42} * \frac{7}{8} = \frac{19}{48}$
3) $\frac{7}{48 }- \frac{19}{48} =- \frac{12}{48} =- \frac{1}{4}$
4) $- \frac{1}{4} +4 \frac{1}{5}=- \frac{1}{4} + \frac{21}{5} = \frac{79}{20} =3 \frac{19}{20}$