Задание
Найти разность:
| \(\displaystyle -\) | \(\displaystyle 3\) | \(\displaystyle 4\) | \(\displaystyle 2\) |
| \(\displaystyle 1\) | \(\displaystyle 3\) | \(\displaystyle 1\) | |
Решение
1. Из единиц числа \(\displaystyle 34\underline{2} \) (это число \(\displaystyle 2 \)) вычитаем единицы числа \(\displaystyle 13\underline{1}\) (это число \(\displaystyle 1\)):
\(\displaystyle 2-1=1.\)
| \(\displaystyle -\) | \(\displaystyle 3\) | \(\displaystyle 4\) | \(\displaystyle \color{red}{2}\) |
| \(\displaystyle 1\) | \(\displaystyle 3\) | \(\displaystyle \color{red}{1}\) | |
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle \color{red}{\bf1}\) |
2. Вычитаем из десятков числа \(\displaystyle 3\underline{4}2\) (это число \(\displaystyle 4\)) десятки числа \(\displaystyle 1\underline{3}1\) (это число \(\displaystyle 3\)):
\(\displaystyle 4-3=1.\)
| \(\displaystyle -\) | \(\displaystyle 3\) | \(\displaystyle \color{red}{4}\) | \(\displaystyle 2\) |
| \(\displaystyle 1\) | \(\displaystyle \color{red}{3}\) | \(\displaystyle 1\) | |
| \(\displaystyle ?\) | \(\displaystyle \color{red}{\bf1}\) | \(\displaystyle 1\) |
3. Вычитаем из сотен числа \(\displaystyle \underline{3}42 \) (это число \(\displaystyle 3\)) сотни числа \(\displaystyle \underline{1}31\) (это число \(\displaystyle 1\)):
\(\displaystyle 3-1=2.\)
| \(\displaystyle -\) | \(\displaystyle \color{red}{3}\) | \(\displaystyle 4\) | \(\displaystyle 2\) |
| \(\displaystyle \color{red}{1}\) | \(\displaystyle 3\) | \(\displaystyle 1\) | |
| \(\displaystyle \color{red}{\bf2}\) | \(\displaystyle 1\) | \(\displaystyle 1\) |
Ответ: \(\displaystyle 211.\)