1) Выполни вычисления с объяснением.
32 * 3 = ☐ + ☐ * ☐
3 * 32
2) Найди значения выражений.
13 * 4
21 * 3
4 * 17
36 * 2
27 : 9 * 13
36 : 4 * 10
28 : 7 * 16
54 : 9 * 14
1)
32 * 3 = (30 + 2) * 3 = 30 * 3 + 2 * 3 = 90 + 6 = 96
3 * 32 = 3 * (30 + 2) = 3 * 30 + 3 * 2 = 90 + 6 = 96
2)
13 * 4 = 52
21 * 3 = 63
4 * 17 = 68
36 * 2 = 72
27 : 9 * 13 = 39
36 : 4 * 10 = 90
28 : 7 * 16 = 64
54 : 9 * 14 = 84
Вычисления:
13 * 4 = (10 + 3) * 4 = 10 * 4 + 3 * 4 = 40 + 12 = 52
21 * 3 = (20 + 1) * 3 = 20 * 3 + 1 * 3 = 60 + 3 = 63
4 * 17 = 4 * (10 + 7) = 4 * 10 + 4 * 7 = 40 + 28 = 68
36 * 2 = (30 + 6) * 2 = 30 * 2 + 6 * 2 = 60 + 12 = 72
27 : 9 * 13 = 3 * (10 + 3) = 3 * 10 + 3 * 3 = 30 + 9 = 39
36 : 4 * 10 = 9 * 10 = 90
28 : 7 * 16 = 4 * (10 + 6) = 4 * 10 + 4 * 6 = 40 + 24 = 64
54 : 9 * 14 = 6 * (10 + 4) = 6 * 10 + 6 * 4 = 60 + 24 = 84