\[\boxed{\mathbf{37.}}\]
\[\textbf{а)}\ 36 - 16 = 20\]
\[72 + 8 = 80\]
\[59 - 40 = 19\]
\[81 + 19 = 100\]
\[53 - 21 = 32\]
\[67 - 0 = 67\]
\[\textbf{б)}\ 11 + 59 - 1 = 70 - 1 = 69\]
\[35 - 14 + 49 = 21 + 49 = 70\]
\[100 - 1 - 62 = 99 - 62 = 37\]
\[45 - (8 + 7) = 45 - 15 = 30\]
\[56 + (13 - 9) = 56 + 4 = 60\]
\[87 - 5 + 18 = 82 + 18 = 100\]