Đăt rôi tính

a 3643 x 582

b842 x327

c 9203x122

d 79281x342

e4291x64

g 9538x22

h 5938x32

i7777x62

\(\rm a)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,3\,6\,4\,3}\\{\,\,\,\,\,5\,8\,2 }\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,\,\,\,7\,2\,8\,6\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,2\,9\,1\,1\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,1\,8\,2\,1\,5\qquad\qquad\,\,\,}\\\hline{\,2\,1\,2\,0\,2\,2\,6\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) \(\rm b)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,8\,4\,2}\\{\,3\,2\,7}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,5\,8\,9\,4\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,6\,8\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,2\,5\,2\,6\,\,\,\qquad\qquad}\\\hline{\,2\,7\,5\,3\,3\,4\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm c)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,9\,2\,0\,3}\\{\,\,\,\,1\,2\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,8\,4\,0\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,8\,4\,0\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,9\,2\,0\,3\qquad\qquad\,}\\\hline{\,1\,1\,2\,2\,7\,6\,6\quad\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm d)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,7\,9\,2\,8\,1}\\{\,\,\,\,\,\,\,\,3\,4\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,5\,8\,5\,6\,2\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,3\,1\,7\,1\,2\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,2\,3\,7\,8\,4\,3\,\,\qquad\qquad\,\,\,\,}\\\hline{\,2\,7\,1\,1\,4\,1\,0\,2\,\,\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) \(\rm e)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,4\,2\,9\,1}\\{\,\,\,\,\,\,\,\,6\,4}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,7\,1\,6\,4\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,2\,5\,7\,4\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,2\,7\,4\,6\,2\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm g)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,9\,5\,3\,8}\\{\,\,\,\,\,\,\,\,\,2\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,9\,0\,7\,6\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\, 1\,9\,0\,7\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,2\,0\,9\,8\,3\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) \(\rm h)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,5\,9\,3\,8}\\{\,\,\,\,\,\,\,\,3\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,1\,8\,7\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,7\,8\,1\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,1\,9\,0\,0\,1\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm i)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,7\,7\,7\,7}\\{\,\,\,\,\,\,\,\,\,6\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,5\,5\,5\,4\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,4\,6\,6\,6\,2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,4\,8\,2\,1\,7\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) 

Đáp án `+` Giải thích các bước giải:

\(\rm a)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,3\,6\,4\,3}\\{\,\,\,\,\,5\,8\,2 }\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,\,\,\,7\,2\,8\,6\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,2\,9\,1\,1\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,1\,8\,2\,1\,5\qquad\qquad\,\,\,}\\\hline{\,2\,1\,2\,0\,2\,2\,6\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm b)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,8\,4\,2}\\{\,3\,2\,7}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,5\,8\,9\,4\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,6\,8\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,2\,5\,2\,6\,\,\,\qquad\qquad}\\\hline{\,2\,7\,5\,3\,3\,4\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm c)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,9\,2\,0\,3}\\{\,\,\,\,1\,2\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,8\,4\,0\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,8\,4\,0\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,9\,2\,0\,3\qquad\qquad\,}\\\hline{\,1\,1\,2\,2\,7\,6\,6\quad\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm d)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,7\,9\,2\,8\,1}\\{\,\,\,\,\,\,\,\,3\,4\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,5\,8\,5\,6\,2\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,3\,1\,7\,1\,2\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,2\,3\,7\,8\,4\,3\,\,\qquad\qquad\,\,\,\,}\\\hline{\,2\,7\,1\,1\,4\,1\,0\,2\,\,\quad\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm e)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,4\,2\,9\,1}\\{\,\,\,\,\,\,\,\,6\,4}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,7\,1\,6\,4\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,2\,5\,7\,4\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,2\,7\,4\,6\,2\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm g)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,9\,5\,3\,8}\\{\,\,\,\,\,\,\,\,\,2\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,9\,0\,7\,6\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\, 1\,9\,0\,7\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,2\,0\,9\,8\,3\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm h)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,5\,9\,3\,8}\\{\,\,\,\,\,\,\,\,3\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,1\,8\,7\,6\,\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,1\,7\,8\,1\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,1\,9\,0\,0\,1\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\) $\\$\(\rm i)\\\begin{array}{*{20}{c}}{ \times \begin{array}{*{20}{c}}{\,7\,7\,7\,7}\\{\,\,\,\,\,\,\,\,\,6\,2}\end{array}\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,\,1\,5\,5\,5\,4\,\,\,\,\,\,\,\,\,\,\,\,}\\{\,\,\,\,\,4\,6\,6\,6\,2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\\hline{\,4\,8\,2\,1\,7\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\)