40,28 − 22,5 : 12,5 + 1,7 = 40,28 − 1,8 + 1,7 = 38,48 + 1,7 = 40,18
1) $\snippet{name: long_division, x: 22.5, y: 12.5, decimal: true}$;
2) $\snippet{name: op_column, sign: '-', x: '40.28', y: '1.80', z: '38.48'}$;
3) $\snippet{name: op_column, sign: '+', x: '38.48', y: '1.70', z: '40.18'}$.

(4,8 − 0,42 * 8,5) : 0,5 = (4,8 − 3,57) : 0,5 = 1,23 : 0,5 = 2,46
1) $\snippet{name: column_multiplication, x: 0.42, y: 8.5}$;
2) $\snippet{name: op_column, sign: '-', x: '4.80', y: '3.57', z: '1.23'}$;
3) $\snippet{name: long_division, x: 1.23, y: 0.5, decimal: true}$.

30 − 19,56 : (4,2 + 3,95) = 30 − 19,56 : 8,15 = 30 − 2,4 = 27,6
1) $\snippet{name: op_column, sign: '+', x: '4.20', y: '3.95', z: '8.15'}$;
2) $\snippet{name: long_division, x: 19.56, y: 8.15, decimal: true}$;
3) $\snippet{name: op_column, sign: '-', x: '30.0', y: '2.4', z: '27.6'}$.

(2,6 − 1,04) : 0,24 * 0,8 = 1,56 : 0,24 * 0,8 = 6,5 * 0,8 = 5,2
1) $\snippet{name: op_column, sign: '-', x: '2.60', y: '1.04', z: '1.56'}$;
2) $\snippet{name: long_division, x: 1.56, y: 0.24, decimal: true}$;
3) $\snippet{name: column_multiplication, x: 6.5, y: 0.8}$.