Giải bài 1 trang 155 - SGK Toán lớp 3

$\dfrac{\begin{align} & \,\,\,64827 \\ & + \\ & \,\,\,21957 \\ \end{align}}{\,\,\,\,86784}$                              $\dfrac{\begin{align} & \,\,\,86149 \\ & + \\ & \,\,\,12735 \\ \end{align}}{\,\,\,\,98884}$

$\dfrac{\begin{align} & \,\,\,37092 \\ & + \\ & \,\,\,35864 \\ \end{align}}{\,\,\,\,72956}$                               $\dfrac{\begin{align} & \,\,\,72468 \\ & + \\ & \,\,\,\,\,\,6829 \\ \end{align}}{\,\,\,\,\,79297}$