a) \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{8923}\\{4157}\end{array}} \\\,\,\,\,4766\end{array}\) | Thử lại: \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{4766}\\{4157}\end{array}} \\\,\,\,\,\,8923\end{array}\) | b) \(\frac{8}{{15}} - \frac{2}{{15}} = \frac{6}{{15}}\) | Thử lại: \(\frac{6}{{15}} + \frac{2}{{15}} = \frac{8}{{15}}\) | c) \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{7,284}\\{5,596}\end{array}} \\\,\,\,\,1,688\end{array}\) | Thử lại: \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{1,688}\\{5,596}\end{array}} \\\,\,\,\,7,284\end{array}\) |
| \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{27069}\\{\,\,9537}\end{array}} \\\,\,\,\,17532\end{array}\) | Thử lại: \[\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{17532}\\{9537}\end{array}} \\\,\,27069\end{array}\] | \(1 - \frac{3}{7} = \frac{7}{7} - \frac{3}{7} = \frac{4}{7}\) | Thử lại: \(\frac{4}{7} + \frac{3}{7} = \frac{7}{7} = 1\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{0,863}\\{0,298}\end{array}} \\\,\,\,\,0,565\end{array}\) | Thử lại: \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{0,565}\\{0,298}\end{array}} \\\,\,\,\,0,863\end{array}\) |
|