\[\boxed{\mathbf{22}\mathbf{.}}\]
\[\textbf{а)}\ 46 + 4 = 50\]
\[50 - 5 = 45\]
\[25 - 6 = 19\]
\[39 + 3 = 42\]
\[62 - 0 = 62\]
\[98 + 0 = 98\]
\[\textbf{б)}\ 88 - 5 + 17 = 83 + 17 = 100\]
\[77 - (4 + 19) = 77 - 23 = 54\]
\[9 + (81 - 53) = 9 + 28 = 37\]
\[6 + 48 - 24 = 54 - 24 = 30\]
\[52 - 13 + 0 = 39\]
\[37 - 0 + 25 = 37 + 25 = 62\]