\[\boxed{\mathbf{19}\mathbf{.}}\]
\[\mathbf{1)\ }\]
| \[\mathbf{Четные}\] | \[\mathbf{Нечетные}\] |
|---|---|
| \[14\] | \[17\] |
| \[12\] | \[11\] |
| \[20\] | \[15\] |
| \[10\] | \[19\] |
| \[18\] | \[13\] |
| \[8\] | |
| \[16\] |
\[\mathbf{2)\ }\]
| \[\mathbf{Увеличить\ на\ 9}\] | \[\mathbf{Уменьшить\ на\ 9}\] |
|---|---|
| \[14 + 9 = 23\] | \[17 - 9 = 8\] |
| \[12 + 9 = 21\] | \[11 - 9 = 2\] |
| \[20 + 9 = 29\] | \[15 - 9 = 6\] |
| \[10 + 9 = 19\] | \[19 - 9 = 10\] |
| \[18 + 9 = 27\] | \[13 - 9 = 4\] |
| \[8 + 9 = 17\] | |
| \[16 + 9 = 25\] |