12 + 1 = 13
3 + 8 = 11
16 − 7 = 9
12 − 3 = 9
19 − 12 = 7
12 − 8 = 4
Условие:
12 + ☐ = 13
☐ + 8 = 11
16 − ☐ = 9
☐ − 3 = 9
☐ − 12 = 7
12 − ☐ = 4
Условие:
12 + ☐ = 13
☐ + 8 = 11
16 − ☐ = 9
☐ − 3 = 9
☐ − 12 = 7
12 − ☐ = 4
12 + 1 = 13
3 + 8 = 11
16 − 7 = 9
12 − 3 = 9
19 − 12 = 7
12 − 8 = 4