Question

помогите пожалуйста!!!

Answer 1

$\displaystyle \tt 30-23,1:\bigg(5\frac{7}{20}-4\frac{6}{35}\bigg)=10,4\\\\\\\\1). \ 5\frac{7}{20}-4\frac{6}{35}=5\frac{49}{140}-4\frac{24}{140}=1\frac{25}{140}=1\frac{5}{28}\\\\2). \ 23,1:1\frac{5}{28}=\frac{231}{10}\cdot\frac{28}{33}=\frac{196}{10}=19,6\\\\3). \ 30-19,6=10,4$