§ Задание 61
\[\boxed{\mathbf{61}\mathbf{.}}\]

\[\textbf{б)}\ 60 - (20 - 12) = 60 - 8 =\]
\[= 52\]
\[70 - (20 - 16) = 70 - 4 = 66\]
\[90 - (20 - 18) = 90 - 2 = 88\]
\[\boxed{\mathbf{61}\mathbf{.}}\]

\[\textbf{б)}\ 60 - (20 - 12) = 60 - 8 =\]
\[= 52\]
\[70 - (20 - 16) = 70 - 4 = 66\]
\[90 - (20 - 18) = 90 - 2 = 88\]