$720 \overset{8}{+} 34 \overset{3}{*} 8 \overset{9}{-} (51 \overset{1}{:} 17 \overset{2}{+} 77) \overset{4}{*} 6 \overset{5}{:} 10 \overset{10}{+} 84 \overset{6}{:} 3 \overset{7}{*} 2 = 720 + 272 - (3 + 77) * 6 : 10 + 28 * 2 = 992 - 80 * 6 : 10 + 56 = 992 - 480 : 10 + 56 = 992 - 48 + 56 = 944 + 56 = 1000$
1) 51 : 17 = 3;
2) 3 + 77 = 80;
3) 34 * 8 = (30 + 4) * 8 = 30 * 8 + 4 * 8 = 240 + 32 = 272;
4) 80 * 6 = 8 * 6 * 10 = 48 * 10 = 480;
5) 480 : 10 = 48;
6) 84 : 3 = (60 + 24) : 3 = 60 : 3 + 24 : 3 = 20 + 8 = 28;
7) 28 * 2 = (20 + 8) * 2 = 20 * 2 + 8 * 2 = 40 + 16 = 56;
8) 720 + 272 = 992
$\snippet{name: op_column, sign: '+', x: '720', y: '272', z: '992'}$
9) 992 − 48 = 944
$\snippet{name: op_column, sign: '-', x: '992', y: '48', z: '944'}$
10) 944 + 56 = 1000
$\snippet{name: op_column, sign: '+', x: '944', y: '56', z: '1000'}$