\[\frac{5}{6} + 2,25 = \frac{5^{\backslash 2}}{6} + 2\frac{1^{\backslash 3}}{4} =\]
\[= \frac{10}{12} + 2\frac{3}{12} = 2\frac{13}{12} = 3\frac{1}{12}.\]