§ Задание 5
\[\boxed{\mathbf{5.}}\]
\[28 + 2 = 30\]
\[24 + 6 = 30\]
\[21 + 9 = 30\]
\[57 + 3 = 60\]
\[55 + 5 = 60\]
\[52 + 8 = 60\]
\[79 + 1 = 80\]
\[76 + 4 = 80\]
\[73 + 7 = 80\]
\[\boxed{\mathbf{5.}}\]
\[28 + 2 = 30\]
\[24 + 6 = 30\]
\[21 + 9 = 30\]
\[57 + 3 = 60\]
\[55 + 5 = 60\]
\[52 + 8 = 60\]
\[79 + 1 = 80\]
\[76 + 4 = 80\]
\[73 + 7 = 80\]