Помогите решить: (/-это дробь) 7)13/7∙24/5 8)3/7:3/28 9)33/4∙24/5 10)4/15 ∙3 11)-41+38...

$7) \frac{13}{7}*\frac{24}{5} = \frac{312}{35}=8 \frac{32}{35}$

$8) \frac{3}{7}:\frac{3}{28}= \frac{3}{7}*\frac{28}{3} = \frac{1}{1}*\frac{4}{1}=4$

$9) \frac{33}{4}*\frac{24}{5}= \frac{33}{1}*\frac{6}{5}= \frac{198}{5} =39,6$

$10) \frac{4}{15}*3= \frac{4}{5} *1= \frac{4}{5}=0,8$

11) -41 + 38 = -3

12) -26 + 43 = 17