Đặt tính rồi tính: 123 + 245 562 – 228 503 – 324 635 – 437

* Hướng dẫn giải

$\begin{array}{l}+\underset{¯}{\begin{array}{l}123\\ 245\end{array}}\\ 368\end{array} \begin{array}{l}-\underset{¯}{\begin{array}{l}562\\ 228\end{array}}\\ 334\end{array}\begin{array}{l}-\underset{¯}{\begin{array}{l}503\\ 324\end{array}}\\ 179\end{array}\begin{array}{l}-\underset{¯}{\begin{array}{l}635\\ 437\end{array}}\\ 198\end{array}$