Giải bài 1 trang 48 - SGK Toán lớp 4

b)

$\dfrac{\begin{align} & \,\,\,\,48796 \\ & + \\ & \,\,\,\, 63584\,\, \\ \end{align}}{\,112380}$              thử lại      $\dfrac{\begin{align} & \,\,\,\,112380 \\ & -\\ & \,\,\,\,\,\,\,63584\,\,\, \\ \end{align}}{\,\,\,\,\,\,48796}$

$\dfrac{\begin{align} & \,\,\,\,10000 \\ & - \\ & \,\,\,\,\,\,\,8989\,\,\, \\ \end{align}}{\,\,\,\,\,\,1011}$             thử lại    $\dfrac{\begin{align} & \,\,\,\,\,\,1011 \\ & +\\ & \,\,\,\,\,\,8989\,\,\,\, \\ \end{align}}{\,\,10000}$