3. Сравни выражения: 15 ⋅ 4 ... 15 + 15 + 15 + 15 7 ⋅ 5 ... 5 ⋅ 7 7 ⋅ 0 ... 0 ⋅ 1

Решение:

• 15 ⋅ 4 = 60
• 15 + 15 + 15 + 15 = 60
• Следовательно, 15 ⋅ 4 = 15 + 15 + 15 + 15.
• 7 ⋅ 5 = 35
• 5 ⋅ 7 = 35
• Следовательно, 7 ⋅ 5 = 5 ⋅ 7 (переместительное свойство умножения).
• 7 ⋅ 0 = 0
• 0 ⋅ 1 = 0
• Следовательно, 7 ⋅ 0 = 0 ⋅ 1 (свойство умножения на ноль).

Результаты сравнения:

• 15 ⋅ 4 = 15 + 15 + 15 + 15
• 7 ⋅ 5 = 5 ⋅ 7
• 7 ⋅ 0 = 0 ⋅ 1