Выполните вычитание: 9 1/21-5 16/63.

\[9\frac{1^{\backslash 3}}{21} - 5\frac{16}{63} = 9\frac{3}{63} - 5\frac{16}{63} =\]

\[= 8\frac{66}{63} - 5\frac{16}{63} = 3\frac{50}{63}\]