$(6 \overset{1}{*} 60) \overset{4}{:} (800 \overset{2}{:} 20) \overset{6}{+} 2 * 60 - (240 \overset{3}{:} 40) \overset{5}{*} 9 = 360 : 40 + 120 - 6 * 9 = 9 + 120 - 54 = 129 \overset{7}{-} 54 = 75$
1) 6 * 60 = 6 * 6 * 10 = 36 * 10 = 360;
2) 800 : 20 = 80 : 2 = 8 д : 2 = 4 д = 40;
3) 240 : 40 = 24 : 4 = 6;
4) 360 : 40 = 36 : 4 = 9;
5) 6 * 9 = 54;
6) 9 + 120 = 129;
7) 129 − 54 = 75.
$\snippet{name: op_column, sign: '-', x: '129', y: '54', z: '75'}$

$80 \overset{4}{*} 4 \overset{7}{-} (900 \overset{1}{:} 30) \overset{5}{*} (280 \overset{2}{:} 40) \overset{8}{+} (2 \overset{3}{*} 90) \overset{6}{:} 3 = 320 - 30 * 7 + 180 : 3 = 320 - 210 + 60 = 110 + 60 = 70$
1) 900 : 30 = 90 : 3 = 9 д : 3 = 3 д = 30;
2) 280 : 40 = 28 : 4 = 7;
3) 2 * 90 = 2 * 9 д = 18 д;
4) 80 * 4 = 8 * 4 * 10 = 32 * 10 = 320;
5) 30 * 7 = 3 * 7 * 10 = 21 * 10 = 210;
6) 180 : 3 = 18 д : 3 = 6 д = 60;
7) 320 − 210 = 32 д − 21 д = 11 д = 110;
8) 110 + 60 = 11 д + 6 д = 17 д = 170.