tính 389 + 120

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{389}\\{120}\end{array}} \\\,\,\,\,509\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{250}\\{115}\end{array}} \\\,\,\,\,135\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{192}\\{173}\end{array}} \\\,\,\,365\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{450}\\{270}\end{array}} \\\,\,\,\,180\end{array}\)