Выполни сложение неравенств

1. \(15 \lt 19\) и \(-5 \lt 2\) , [ ][ \(\lt\) | \(\gt\) ][ ].
2. \(4 \gt -3\) и \(6 \gt 3\) , [ ][ \(\gt\) | \(\lt\) ][ ].
3. \(a - 5b \gt 1 + 2a\) и \(3a + b \gt 8 - 2a\) ,
   [ ][ \(\gt\) | \(\lt\) ][ ].
4. \(2a - 9b \lt a + 11\) и \(3a + 11b \lt b - a\) , [ ][ \(\lt\) | \(\gt\) ][ ].