Выполните действие 4/51: 1 целая 2/17 - 57/64

$\frac{4}{51} : \frac{17 + 2}{17} - \frac{57}{64}$ = $\frac{4}{51} : 1 \frac{2}{17} - \frac{57}{64}$ = $\frac{4}{51} : \frac{19}{17} - \frac{57}{64}$ = $\frac{4}{51} * \frac{17}{19} - \frac{57}{64}$ = $\frac{4 * 17}{51 * 19} - \frac{57}{64}$ = $\frac{4}{3 * 19} - \frac{57}{64}$ = $\frac{4}{57} - \frac{57}{64}$ = $\frac{4 * 64}{57 * 64} - \frac{57 * 57}{64 * 57}$ = $\frac{4 * 64 - 57 * 57}{57 * 64}$ = $\frac{256 - 3249}{3648}$ = $\frac{-2993}{3648}$