$\snippet{name: long_division, x: 688, y: 4}$
 
$\snippet{name: long_division, x: 635, y: 5}$
 
$\snippet{name: long_division, x: 824, y: 7}$

71 − 57 : 3 = 70
91 : (39 − 26) = 7
5 * 16 : 40 = 2
19 * (80 − 77) = 57

Вычисления:
71 − 57 : 3 = 71 − (30 + 27) : 3 = 71 − 30 : 3 + 27 : 3 = 71 − 10 + 9 = 61 + 9 = 70
91 : (39 − 26) = 91 : 13 = 7
5 * 16 : 40 = (5 * (10 + 6)) : 40 = (5 * 10 + 5 * 6) : 40 = (50 + 30) : 40 = 80 : 40 = 2
19 * (80 − 77) = 19 * 3 = (10 + 9) * 3 = 10 * 3 + 9 * 3 = 30 + 27 = 57