$35 \overset{3}{-} (17 \overset{1}{-} 9) \overset{4}{+} (54 \overset{2}{-} 6) = 75$
1) 17 − 9 = 8;
2) 54 − 6 = 48;
3) 35 − 8 = 27;
4) 27 + 48 = 24 + 40 + 8 = 67 + 8 = 75.
 
$(90 \overset{1}{-} 52) \overset{3}{+} 14 \overset{4}{-} (15 \overset{2}{+} 37) = 0$
1) 90 − 52 = 90 − 50 − 2 = 40 − 2 = 38;
2) 15 + 37 = 15 + 30 + 7 = 45 + 7 = 52;
3) 38 + 14 = 38 + 10 + 4 = 48 + 4 = 52;
4) 52 − 52 = 0.
 
$(497 \overset{1}{+} 63) \overset{3}{-} (304 \overset{2}{-} 175) = 431$
1) $\snippet{name: op_column, sign: '+', x: '497', y: '63', z: '560'}$;
2) $\snippet{name: op_column, sign: '-', x: '304', y: '175', z: '129'}$;
3) $\snippet{name: op_column, sign: '-', x: '560', y: '129', z: '431'}$.
 
$912 \overset{2}{-} (246 \overset{1}{+} 589) \overset{3}{+} 478 = 555$
1) $\snippet{name: op_column, sign: '+', x: '246', y: '589', z: '835'}$;
2) $\snippet{name: op_column, sign: '-', x: '912', y: '835', z: '77'}$;
3) $\snippet{name: op_column, sign: '+', x: '478', y: '77', z: '555'}$.