Đặt tính rồi tính a) 3 687 + 2 757

a) 3 687 + 2 757

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{3\,\,687}\\{2\,757}\end{array}\,\,} \\\,\,\,\,\,6\,444\end{array}\)

b) 18 327 – 5 275

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{18\,\,327}\\{\,\,\,5\,\,275}\end{array}\,\,} \\\,\,\,\,13\,\,052\end{array}\)

c) 3 509 ´ 9

\(\begin{array}{l}\underline { \times \begin{array}{*{20}{c}}{3\,\,509}\\{\,\,\,\,\,\,\,\,\,\,9}\end{array}\,\,} \\31\,\,581\end{array}\)

d) 34 065 : 6

\(\left. {\begin{array}{*{20}{c}}{34\,\,065}\\{040\,\,\,\,\,\,\,\,}\\{\,\,46}\\{\,\,\,\,\,\,\,\,\,45}\\{\,\,\,\,\,\,\,\,\,\,\,\,\,3}\end{array}} \right|\begin{array}{*{20}{c}}{\underline {\,\,\,\,6\,\,\,\,} }\\{5\,\,677}\\{}\\{}\\{}\end{array}\)