Решите пример срочно

$\displaystyle x= \frac{\left(3.9-2.55+4\frac{5}{12}-1\frac{1}{15}\right):4.7}{\left(0.81\cdot8\frac{1}{3}-0.57:4 \frac{3}{4}\right):2.21+4.125:2\frac{1}{16}} \\ \\ 1.\ 3.9-2.55=1.35=1 \frac{35}{100}=1 \frac{7}{20}=\frac{27}{20} \\ \\ 2.\ 4\frac{5}{12}-1\frac{1}{15}=\frac{53}{3\cdot4}-\frac{16}{3\cdot5}=\frac{53\cdot5-16\cdot4}{3\cdot4\cdot5}=\frac{201}{60}=\frac{67}{20} \\ \\ 3.\ \frac{27}{20}+\frac{67}{20}=\frac{94}{20}=\frac{47}{10} \\ \\ 4.\ \frac{47}{10}:4.7=4.7:4.7=1$
$\displaystyle 5.\ 0.81\cdot8\frac{1}{3}=\frac{81}{100}\cdot\frac{25}{3}=\frac{81\cdot25}{100\cdot3}=\frac{27}{4} \\ \\ 6.\ 0.57:4\frac{3}{4}=\frac{57}{100}:\frac{19}{4}=\frac{57\cdot4}{100\cdot19}=\frac{3}{25} \\ \\ 7.\ \frac{27}{4}-\frac{3}{25}=\frac{27\cdot25-3\cdot4}{4\cdot25}=\frac{663}{100} \\ \\ 8.\ \frac{663}{100}:2.21=\frac{663}{100}:2\frac{21}{100}=\frac{663}{100}:\frac{221}{100}=\frac{663\cdot100}{100\cdot221}=3$
$\displaystyle 9.\ 4.125:2\frac{1}{16}=4\frac{125}{1000}:\frac{33}{16}=\frac{4125}{1000}:\frac{33}{16}=\frac{4125\cdot16}{1000\cdot33}=2 \\ \\ 10.\ 3+2=5 \\ \\ 11.\ 1:5=\frac{1}{5}$

Ответ: 1/5 = 0.2