☐
15 − ☐ + 9 = 18
13 + ☐ − 9 = 9
11 + ☐ − 7 = 8
☐☐ − 12 = 24
☐☐ − 38 = 0
☐☐ − 1 = 89
53 + 7 = ☐☐
47 − ☐ = 40
☐☐ + 9 = 20
15 − 6 + 9 = 18
13 + 5 − 9 = 9
11 + 4 − 7 = 8
36 − 12 = 24
38 − 38 = 0
90 − 1 = 89
53 + 7 = 60
47 − 7 = 40
11 + 9 = 20
Вычисления
15 − ☐ + 9 = 18
24 − ☐ = 18
☐ = 24 − 18
☐ = 6
13 + ☐ − 9 = 9
4 + ☐ = 9
☐ = 9 − 4
☐ = 5
11 + ☐ − 7 = 8
4 + ☐ = 8
☐ = 8 − 4
☐ = 4
☐☐ − 12 = 24
☐☐ = 24 + 12
☐☐ = 36
☐☐ − 38 = 0
☐☐ = 0 + 38
☐☐ = 38
☐☐ − 1 = 89
☐☐ = 89 + 1
☐☐ = 90
53 + 7 = 60
47 − ☐ = 40
☐ = 47 − 40
☐ = 7
☐☐ + 9 = 20
☐☐ = 20 − 9
☐☐ = 11