Помогите пожалуста с дробями

$\frac{18}{25}*\frac{10}{27}*7\frac{1}{2}=\frac{18}{25}*\frac{10}{27}*\frac{15}{2}=\frac{2}{5}*\frac{2}{3}*\frac{15}{2}=\frac{2}{1}*\frac{2}{1}*\frac{1}{2}=\frac{2*2}{2}=2$

$12\frac{6}{7}*\frac{2}{25}*\frac{7}{18}=\frac{90}{7}*\frac{2}{25}*\frac{7}{18}=\frac{5}{1}*\frac{2}{25}*\frac{1}{1}=\frac{1}{1}*\frac{2}{5}*\frac{1}{1}=\frac{2}{5}$

9) $8\frac{1}{3}*2\frac{1}{5}*1\frac{1}{11}=\frac{25}{3}*\frac{11}{5}*\frac{12}{11}=\frac{5}{1}*\frac{1}{1}*\frac{4}{1}=20$