(50 + 19) * 2
1 способ
(50 + 19) * 2 = 69 * 2 = 138
2 способ
(50 + 19) * 2 = 50 * 2 + 19 * 2 = 100 + 38 = 138
Вычисления:
$\snippet{name: op_column, sign: '‧', x: '69', y: '2', z: '138'}$
50 * 2 = 5 * 10 * 2 = 5 * 2 * 10 = 10 * 10 = 100
$\snippet{name: op_column, sign: '‧', x: '19', y: '2', z: '38'}$