8,6 + (18 − 9,7) − (3,65 + 10,4) = 8,6 + 8,3 − 14,05 = 16,9 − 14,05 = 2,85
1) $\snippet{name: op_column, sign: '-', x: '18,0', y: '9,7', z: '8,3'}$;
2) $\snippet{name: op_column, sign: '+', x: '3,65', y: '10,40', z: '14,05'}$;
3) $\snippet{name: op_column, sign: '+', x: '8,6', y: '8,3', z: '16,9'}$;
4) $\snippet{name: op_column, sign: '-', x: '16,90', y: '14,05', z: '2,85'}$.

30 − (25,48 − 5,4 + 0,6) + 1,09 = 30 − (20,08 + 0,6) + 1,09 = 30 − 20,68 + 1,09 = 9,32 + 1,09 = 10,41
1) $\snippet{name: op_column, sign: '-', x: '25,48', y: '5,40', z: '20,08'}$;
2) $\snippet{name: op_column, sign: '+', x: '20,08', y: '0,60', z: '20,68'}$;
3) $\snippet{name: op_column, sign: '-', x: '30,00', y: '20,68', z: '9,32'}$;
4) $\snippet{name: op_column, sign: '+', x: '9,32', y: '1,09', z: '10,41'}$.

17,24 − (0,25 + 8,75) − (4,7 + 0,35) = 17,24 − 9 − 5,05 = 8,24 − 5,05 = 3,19
1) $\snippet{name: op_column, sign: '+', x: '0,25', y: '8,75', z: '9,00'}$;
2) $\snippet{name: op_column, sign: '+', x: '4,70', y: '0,35', z: '5,05'}$;
3) $\snippet{name: op_column, sign: '-', x: '17,24', y: '9,00', z: '8,24'}$;
4) $\snippet{name: op_column, sign: '-', x: '8,24', y: '5,05', z: '3,19'}$.

20 − 6,78 − (10 − 0,023) + 0,22 = 13,22 − 9,977 + 0,22 = 3,243 + 0,22 = 3,463
1) $\snippet{name: op_column, sign: '-', x: '10,000', y: '0,023', z: '9,977'}$;
2) $\snippet{name: op_column, sign: '-', x: '20,00', y: '6,78', z: '13,22'}$;
3) $\snippet{name: op_column, sign: '-', x: '13,220', y: '9,977', z: '3,243'}$;
4) $\snippet{name: op_column, sign: '+', x: '3,243', y: '0,22', z: '3,463'}$.