(77 + 19) + 51 = 77 + (19 + 51) = 77 + 70 = 147
18 + (32 + 7) = (18 + 32) + 7 = 50 + 7 = 57
(623 + 1 200) + 800 = 623 + (1 200 + 800) = 623 + 2 000 = 2 623
327 + (33 + 589) = (327 + 33) + 589 = 360 + 589 = 949
Вычисления:
$\snippet{name: op_column, sign: '+', x: '19', y: '51', z: '70'}$
$\snippet{name: op_column, sign: '+', x: '77', y: '70', z: '147'}$
$\snippet{name: op_column, sign: '+', x: '18', y: '32', z: '50'}$
$\snippet{name: op_column, sign: '+', x: '327', y: '33', z: '360'}$