\[\boxed{\mathbf{32.}}\]
\[\textbf{а)}\ 31 + 2 \cdot 3 = 31 + 6 = 37\]
\[50 + 2 \cdot 7 = 50 + 14 = 64\]
\[62 + 2 \cdot 4 = 62 + 8 = 70\]
\[42 + 3 \cdot 6 = 42 + 18 = 60\]
\[32 - 6 \cdot 2 = 32 - 12 = 20\]
\[59 - 3 \cdot 3 = 59 - 9 = 50\]
\[\textbf{б)}\ 68 - 3 \cdot 6 = 68 - 18 = 50\]
\[44 + 4 \cdot 4 = 44 + 16 = 60\]
\[2 \cdot 9 + 82 = 18 + 82 = 100\]