tính 64 – 46

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{64}\\{46}\end{array}} \\\,\,\,\,18\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{68}\\{24}\end{array}} \\\,\,\,\,92\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{76}\\{38}\end{array}} \\\,\,\,\,38\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{25}\\{69}\end{array}} \\\,\,\,\,94\end{array}\)