Giải bài 1 trang 84 - SGK Toán lớp 4

Đặt tính rồi tính:

a) 4725 : 15
    4674 : 82
   4935 : 44
b) 35136: 18
    18408 : 52
    17826 : 48                             
Lời giải:
a) 
\(\left. \begin{align} & \begin{matrix} 4725\\ \,\,\,\,\,22\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,\,75\\ & \,\,\,\,\,\,\,\,\,\,\,\,0\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,15\,\,\,\,\,\,\,}{315\,\,} {} \\ {} \\ \\\\\end{matrix}\)                                                                  \(\left. \begin{align} & \begin{matrix} 4674\\ \,\,\,\,\,\,574\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,\,\,\,\,0\\\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,82\,\,\,\,\,\,\,}{57\,\,} {} \\ {} \\ \\\\\end{matrix} \)                                                                                                                                                                                                                                                                                                                                                                                                                                               
\(\left. \begin{align} & \begin{matrix} 4935\\ \,\,\,\,\,53\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,\,95\\ & \,\,\,\,\,\,\,\,\,\,\,\,7\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,44\,\,\,\,\,\,\,}{112\,\,} {} \\ {} \\ \\\\\end{matrix}\)
b) 
\(\left. \begin{align} & \begin{matrix} 35136\\171\,\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,93\\ & \,\,\,\,\,\,\,\,\,36\\ & \,\,\,\,\,\,\,\,\,\,\,\,0\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,18\,\,\,\,\,\,\,}{1952\,\,} {} \\ {} \\ \\\\\\\end{matrix}\)\(\)\(\left. \begin{align} & \begin{matrix} 18408\\\,\,\,\,280\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,208\\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,0\\\ \end{align} \right|\begin{matrix} \dfrac{\,\,\,\,52\,\,\,\,\,\,\,}{354\,\,} {} \\ {} \\ \\\\\end{matrix}\)                                                                         
 
\(\left. \begin{align} & \begin{matrix} 17826\\\,\,\,\,\,342\,\,\,\,\,\, \\ \end{matrix} \\ & \,\,\,\,\,\,\,\,\,\,\,66\\ & \,\,\,\,\,\,\,\,\,\,\,18\\ \\\end{align} \right|\begin{matrix} \dfrac{\,\,\,\,48\,\,\,\,\,\,\,}{371\,\,} {} \\ {} \\ \\\\\end{matrix}\)