5 + 14 + ☐ = 89;
7 + 13 + ☐ = 46;
70 − 3 − ☐ = 47;
80 − 4 − ☐ = 70.
5 + 14 + ☐ = 89
19 + ☐ = 89
☐ = 70
19 + 70 = 89
89 = 89
Ответ: 5 + 14 + 70 = 89
7 + 13 + ☐ = 46
20 + ☐ = 46
☐ = 26
20 + 26 = 46
46 = 46
Ответ: 7 + 13 + 26 = 46
70 − 3 − ☐ = 47
67 − ☐ = 47
☐ = 20
67 − 20 = 47
47 = 47
Ответ: 70 − 3 − 20 = 47
80 − 4 − ☐ = 70
76 − ☐ = 70
☐ = 6
76 − 6 = 70
70 = 70
Ответ: 80 − 4 − 6 = 70