1 3/35:1 1/56-3 5/21:1 22/63 помогите пожалуйста

Решите задачу:

$1 \frac{3}{35} \div 1 \frac{1}{56} = \frac{38}{35} \div \frac{57}{56} = \\ \frac{38}{35} \times \frac{56}{57} = \frac{2\times 8}{5 \times 3} = \frac{16}{15} = 1 \frac{1}{15}$
$3 \frac{5}{21} \div \frac{22}{63 } = \frac{68}{21} \div \frac{22}{63} = \\ = \frac{68}{21} \times \frac{63}{22} = \frac{34 \times 3}{11} = \frac{102}{11} =$
$9 \frac{3}{11}$
$1 \frac{1}{15} - 9 \frac{3}{11} = 1 \frac{11}{165} - 9 \frac{45}{165} = \\ = - 8 \frac{34}{165}$