§ Задание 228
\[\boxed{\text{4.\ 228}}\]
\[19 - 17 = 2{^\circ}С.\]
\[17 - 17 = 0{^\circ}С.\]
\[10 - 17 = - 7{^\circ}С.\]
\[0 - 17 = - 17{^\circ}С.\]
\[\boxed{\text{4.\ 228}}\]
\[19 - 17 = 2{^\circ}С.\]
\[17 - 17 = 0{^\circ}С.\]
\[10 - 17 = - 7{^\circ}С.\]
\[0 - 17 = - 17{^\circ}С.\]