Giải bài 2 trang 125 - SGK Toán lớp 4

$a) \\\dfrac{\begin{align} & \,\,\,\,53867\\ & + \\ & \,\,\,\, 49608\,\, \\ \end{align}}{\,\,103475}$                   $b)\\\dfrac{\begin{align} & \,\,\,\,\,\,\,482\\ & \times \\ &\,\, \,\,\,\,\,307\,\,\,\, \\ \end{align}}{\,\,\,\,3374}\\\,\underline{1446\,\,\,\,\,\,\,}\\\,147974$  

 $c)\\\dfrac{\begin{align} & \,\,\,\,86752\\ & -\\ & \,\,\,\,91846\,\,\, \\ \end{align}}{\,772906}$             $d)\\\left. \begin{align} & \begin{matrix} 18490\\\,\,\,\,\,\,\,1290\,\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,00\\\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,215\,\,\,\,\,\,\,}{86\,\,} {} \\ {} \\ \\\\\end{matrix}$