Краткое пояснение: В этих примерах нужно исправить ошибки в вычислениях, чтобы равенства стали верными.
- 2 ⋅ 7 + 2 ⋅ 3 = 2 ⋅ 10
2 ⋅ 7 = 14, 2 ⋅ 3 = 6, 14 + 6 = 20, 2 ⋅ 10 = 20. Тут всё верно.
- 2 ⋅ 9 – 2 ⋅ 4 = 2 ⋅ 6
2 ⋅ 9 = 18, 2 ⋅ 4 = 8, 18 – 8 = 10, 2 ⋅ 6 = 12. Тут ошибка. Правильное решение: 2 ⋅ 9 – 2 ⋅ 4 = 10