4,2 : (2,25 - 1 целая 7/8 × 3 целых 1/3)

Решите задачу:

$4,\:2\::\:\left(2,\:25\:-\:1\frac{7}{8}\:*\:3\frac{1}{3}\right)= 4.2:(2.25- \frac{15}{8} *3 \frac{1}{3} )= \\ \\ =4.2:(2.25 - \frac{15}{8} * \frac{10}{3})= \big{ \frac{4.2}{2.25- \frac{15}{8}* \frac{10}{3} } } = \big{ \frac{4.2}{\big{ \frac{9}{4}}- \big{\frac{5}{4}*5 }} }= \\ \\$
$\mathbf{ \frac{4.2}{ \frac{9}{4}- \frac{25}{4} } }= \frac{4.2}{-4} =\textbf{-1.05}$