8 + 4 + ☐ = 16;
7 + 9 + ☐ = 20;
15 − ☐ − 8 = 0;
17 − ☐ − 10 = 0;
9 + 0 + ☐ = 20;
9 − ☐ + 15 = 15.
8 + 4 + ☐ = 16
12 + ☐ = 16
☐ = 4
12 + 4 = 16
16 = 16
Ответ: 8 + 4 + 4 = 16
7 + 9 + ☐ = 20
16 + ☐ = 20
☐ = 4
16 + 4 = 20
20 = 20
Ответ: 7 + 9 + 4 = 20
15 − ☐ − 8 = 0
7 − ☐ = 0
☐ = 7
7 − 7 = 0
0 = 0
Ответ: 15 − 7 − 8 = 0
17 − ☐ − 10 = 0
7 − ☐ = 0
☐ = 7
7 − 7 = 0
0 = 0
Ответ: 17 − 7 − 10 = 0
9 + 0 + ☐ = 20
9 + ☐ = 20
☐ = 11
9 + 11 = 20
20 = 20
Ответ: 9 + 0 + 11 = 20
9 − ☐ + 15 = 15
24 − ☐ = 15
☐ = 9
24 − 9 = 15
15 = 15
Ответ: 9 − 15 + 15 = 15