Задание
Перемножить числа:
| \(\displaystyle 2\) | \(\displaystyle 4\) | \(\displaystyle 1\) | ||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle 2\) | |||
| \(\displaystyle +\) | ||||
Решение
1. Умножаем единицы числа \(\displaystyle 3\underline{2}\) (это цифра \(\displaystyle 2\)) на число \(\displaystyle 241\):
\(\displaystyle 2 \cdot 241=482 \).
| \(\displaystyle \bf2\) | \(\displaystyle \bf4\) | \(\displaystyle \bf1\) | ||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle \bf2\) | |||
| \(\displaystyle \bf4\) | \(\displaystyle \bf8\) | \(\displaystyle \bf2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
2. Умножаем десятки числа \(\displaystyle \underline{3}2\) (это цифра \(\displaystyle 3\)) на число \(\displaystyle 241\):
\(\displaystyle 3 \cdot 241=723\).
Записываем результат так, чтобы единицы \(\displaystyle 723\) шли под той цифрой, на которую мы умножали; в нашем случае это десятки числа \(\displaystyle \underline{3}2\) (то есть цифра \(\displaystyle 3\)):
| \(\displaystyle \bf2\) | \(\displaystyle \bf4\) | \(\displaystyle \bf1\) | ||
| \(\displaystyle \times\) | ||||
| \(\displaystyle \bf3\) | \(\displaystyle 2\) | |||
| \(\displaystyle 4\) | \(\displaystyle 8\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle \bf7\) | \(\displaystyle \bf2\) | \(\displaystyle \bf3\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
3. Складываем числа:
| \(\displaystyle 4\) | \(\displaystyle 8\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 7\) | \(\displaystyle 2\) | \(\displaystyle 3\) | ||
| \(\displaystyle \bf7\) | \(\displaystyle \bf7\) | \(\displaystyle \bf1\) | \(\displaystyle \bf2\) | |
В итоге получаем:
| \(\displaystyle 2\) | \(\displaystyle 4\) | \(\displaystyle 1\) | ||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle 2\) | |||
| \(\displaystyle 4\) | \(\displaystyle 8\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 7\) | \(\displaystyle 2\) | \(\displaystyle 3\) | ||
| \(\displaystyle 7\) | \(\displaystyle 7\) | \(\displaystyle 1\) | \(\displaystyle 2\) | |
Ответ: \(\displaystyle 7712 \).