20 + 25 = 45
40 + 25 = 65
15 + 25 = 40
38 + 25 = 63

30 + 20 = 50
30 + 40 = 70
30 + 15 = 45
30 + 38 = 68

20 − 15 = 5
40 − 15 = 25
15 − 15 = 0
38 − 15 = 23

80 − 20 = 60
80 − 40 = 40
80 − 15 = 65
80 − 38 = 42
Вычисления:
$\snippet{name: op_column, sign: '+', x: '20', y: '25', z: '45'}$
$\snippet{name: op_column, sign: '+', x: '40', y: '25', z: '65'}$
$\snippet{name: op_column, sign: '+', x: '15', y: '25', z: '40'}$
$\snippet{name: op_column, sign: '+', x: '38', y: '25', z: '63'}$
$\snippet{name: op_column, sign: '+', x: '30', y: '20', z: '50'}$
$\snippet{name: op_column, sign: '+', x: '30', y: '40', z: '70'}$
$\snippet{name: op_column, sign: '+', x: '30', y: '15', z: '45'}$
$\snippet{name: op_column, sign: '+', x: '30', y: '38', z: '68'}$
$\snippet{name: op_column, sign: '-', x: '20', y: '15', z: '5'}$
$\snippet{name: op_column, sign: '-', x: '40', y: '15', z: '25'}$
$\snippet{name: op_column, sign: '-', x: '15', y: '15', z: '0'}$
$\snippet{name: op_column, sign: '-', x: '38', y: '15', z: '23'}$
$\snippet{name: op_column, sign: '-', x: '80', y: '20', z: '60'}$
$\snippet{name: op_column, sign: '-', x: '80', y: '40', z: '40'}$
$\snippet{name: op_column, sign: '-', x: '80', y: '15', z: '65'}$
$\snippet{name: op_column, sign: '-', x: '80', y: '38', z: '42'}$