$215 \overset{4}{*} (368 \overset{1}{-} 274) \overset{5}{*} (78 \overset{3}{+} 8664 \overset{2}{:} 76) = 215 * 94 * (78 + 114) = 20210 * 192 = 3880320$
1) $\snippet{name: op_column, sign: '-', x: '368', y: '274', z: '94'}$;
2) $\snippet{name: long_division, x: 8664, y: 76}$;
3) $\snippet{name: op_column, sign: '+', x: '78', y: '114', z: '192'}$;
4) $\snippet{name: column_multiplication, x: 215, y: 94}$;
5) .

$(8034 \overset{1}{:} 78 \overset{2}{+} 256) \overset{5}{+} 68 \overset{4}{*} (127 \overset{3}{+} 128) = (103 + 256) + 68 * 255 = 359 + 17340 = 17699$
1) $\snippet{name: long_division, x: 8034, y: 78}$;
2) $\snippet{name: op_column, sign: '+', x: '103', y: '256', z: '359'}$;
3) $\snippet{name: op_column, sign: '+', x: '127', y: '128', z: '255'}$;
4) $\snippet{name: column_multiplication, x: 68, y: 255}$;
5) $\snippet{name: op_column, sign: '+', x: '17340', y: '359', z: '17699'}$.

$4080 \overset{4}{-} (352719 \overset{1}{-} 57837) \overset{2}{:} 98 \overset{5}{+} 307 \overset{3}{*} 107 = 4080 - 294882 : 98 + 307 * 107 = 4080 - 3009 + 32849 = 1071 + 32849 = 33920$
1) $\snippet{name: op_column, sign: '-', x: '352719', y: '57837', z: '294882'}$;
2) $\snippet{name: long_division, x: 294882, y: 98}$;
3) $\snippet{name: column_multiplication, x: 307, y: 107}$;
4) $\snippet{name: op_column, sign: '-', x: '4080', y: '3009', z: '1071'}$;
5) $\snippet{name: op_column, sign: '+', x: '1071', y: '32849', z: '33920'}$.

$988 \overset{5}{+} 1530 \overset{3}{*} (12 \overset{1}{*} 6 \overset{2}{-} 38) \overset{4}{*} 15 = 988 + 1530 * (72 - 38) * 15 = 988 + 1530 * 34 * 15 = 988 + 52020 * 15 = 988 + 780300 = 781288$
1) $\snippet{name: column_multiplication, x: 12, y: 6}$;
2) $\snippet{name: op_column, sign: '-', x: '72', y: '38', z: '34'}$;
3) ;
4) ;
5) $\snippet{name: op_column, sign: '+', x: '988', y: '780300', z: '781288'}$.