0,65 * 3,4 + 45,25 : 25 = 2,21 + 1,81 = 4,02
1) $\snippet{name: column_multiplication, x: 0.65, y: 3.4}$;
2) $\snippet{name: long_division, x: 45.25, y: 25, decimal: true}$;
3) $\snippet{name: op_column, sign: '+', x: '2,21', y: '1,81', z: '4,02'}$.

19,6 : 1,6 − 0,85 * 4,4 = 12,25 − 3,74 = 8,51
1) $\snippet{name: long_division, x: 19.6, y: 1.6, decimal: true}$;
2) $\snippet{name: column_multiplication, x: 0.85, y: 4.4}$;
3) $\snippet{name: op_column, sign: '-', x: '12,25', y: '3,74', z: '8,51'}$.