$81 \overset{3}{:} (11 \overset{1}{-} 2) \overset{4}{*} 8 \overset{6}{+} 9 \overset{5}{*} (14 \overset{2}{:} 2) = 81 : 9 * 8 + 9 * 7 = 9 * 8 + 63 = 72 + 63 = 135$
1) 11 − 2 = 9;
2) 14 : 2 = 7;
3) 81 : 9 = 9;
4) 9 * 8 = 72;
5) 9 * 7 = 63;
6) 72 + 63 = 135.
$\snippet{name: op_column, sign: '+', x: '72', y: '63', z: '135'}$

$7 \overset{4}{*} 8 \overset{7}{-} (5 \overset{1}{*} 6 \overset{2}{-} 12) \overset{5}{:} 3 \overset{8}{-} 49 \overset{6}{:} (7 \overset{3}{*} 7) = 56 - (30 - 12) : 3 - 49 : 49 = 56 - 18 : 3 - 1 = 56 - 6 - 1 = 50 - 1 = 49$
1) 5 * 6 = 30;
2) 30 − 12 = 18;
3) 7 * 7 = 49;
4) 7 * 8 = 56;
5) 18 : 3 = 6;
6) 49 : 49 = 1;
7) 56 − 6 = 50;
8) 50 − 1 = 49.

$0 \overset{4}{*} (6 \overset{1}{+} 3) \overset{8}{+} 4 \overset{5}{:} 4 \overset{6}{*} (15 \overset{3}{-} 3 \overset{2}{*} 2) \overset{9}{-} 0 \overset{7}{:} 8 = 0 * 9 + 4 : 4 * (15 - 6) - 0 = 0 + 1 * 9 - 0 = 9$
1) 6 + 3 = 9;
2) 3 * 2 = 6;
3) 15 − 6 = 9;
4) 0 * 9 = 0;
5) 4 : 4 = 1;
6) 1 * 9 = 9;
7) 0 : 8 = 0;
8) 0 + 9 = 0;
9) 9 − 0 = 9.