Đặt tính rồi tính

78,9 – 34,56 =...	23,67 – 7,123 =...	456,1 – 189,4 =...
345,9 – 234,5 =...	5,678 – 2,134 =...	134,56 – 67,89 =...
189,2 – 89,56 =...	12,34 – 4,123 =...	67,8 – 23,45 =...
456,7 – 345,6 =...	23,456 – 5,12 =...	345,1 – 167,8 =...

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{45,6}\\{12,3}\end{array}} \\\,\,\,\,33,3\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{123,78}\\{\,\,\,\,4,56}\end{array}} \\\,\,\,119,22\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{7,89}\\{\,\,\,2,134}\end{array}} \\\,\,\,\,\,\,\,5,756\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{234,5}\\{\,\,\,89,1}\end{array}} \\\,\,\,\,145,4\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,7}\\{345,2}\end{array}} \\\,\,\,\,\,111,5\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{89,12}\\{\,\,5,67}\end{array}} \\\,\,\,83,45\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,9}\\{\,\,\,\,\,\,\,\,1,23}\end{array}} \\\,\,\,\,\,344,67\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,456}\\{\,6,78}\end{array}} \\\,\,\,\,16,676\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{167,4}\\{\,\,78,9}\end{array}} \\\,\,\,\,\,\,88,5\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,34}\\{\,\,\,\,3,456}\end{array}} \\\,\,\,\,\,\,\,\,8,884\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{234,5}\\{\,\,67,8}\end{array}} \\\,\,\,\,166,7\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{56,7}\\{\,\,\,\,\,\,\,4,123}\end{array}} \\\,\,\,\,\,\,\,\,52,577\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,2}\\{123,4}\end{array}} \\\,\,\,\,\,\,65,8\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,1}\\{\,\,\,\,\,\,\,\,\,\,\,\,2,345}\end{array}} \\\,\,\,\,\,\,\,\,\,\,342,755\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{78,9}\\{\,\,\,\,\,5,67}\end{array}} \\\,\,\,\,\,\,73,23\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,345}\\{1,23}\end{array}} \\\,\,\,\,11,115\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{167,8}\\{\,\,\,\,\,\,56,78}\end{array}} \\\,\,\,\,\,\,\,\,111,02\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,2}\\{234,5}\end{array}} \\\,\,\,\,221,7\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{89,34}\\{\,\,\,\,6,789}\end{array}} \\\,\,\,\,\,82,551\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{123,6}\\{\,\,45,1}\end{array}} \\\,\,\,\,\,\,78,5\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,9}\\{\,\,78,9}\end{array}} \\\,\,\,267\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,67}\\{\,2,56}\end{array}} \\\,\,\,\,21,11\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5,678}\\{1,234}\end{array}} \\\,\,\,4,444\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{134,5}\\{\,\,67,8}\end{array}} \\\,\,\,\,\,\,66,7\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,1}\\{189,2}\end{array}} \\\,\,\,266,9\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,\,67,89}\\{12,3}\end{array}} \\\,\,\,\,\,\,\,\,55,59\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,4}\\{123,5}\end{array}} \\\,\,\,\,\,\,65,9\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,6}\\{\,\,56,7}\end{array}} \\\,\,\,288,9\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,7,123}\\{2,45}\end{array}} \\\,\,\,\,\,\,4,673\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,456}\\{\,\,5,678}\end{array}} \\\,\,\,\,17,778\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{123,7}\\{\,45,6}\end{array}} \\\,\,\,\,\,\,78,1\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,2}\\{\,\,\,\,\,89,12}\end{array}} \\\,\,\,\,\,367,08\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,34}\\{\,\,\,\,\,1,789}\end{array}} \\\,\,\,\,\,\,10,551\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{234,9}\\{167,4}\end{array}} \\\,\,\,\,\,\,\,67,5\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{56,78}\\{\,\,3,45}\end{array}} \\\,\,\,\,53,33\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,5}\\{\,\,78,9}\end{array}} \\\,\,\,110,6\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5,67}\\{\,\,2,134}\end{array}} \\\,\,\,\,\,\,3,536\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,1}\\{123,6}\end{array}} \\\,\,\,221,5\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{67,89}\\{12,34}\end{array}} \\\,\,\,\,55,55\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,7}\\{234,5}\end{array}} \\\,\,\,\,222,2\end{array}\)

456,9 – 189,5 = 267,4

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,9}\\{189,5}\end{array}} \\\,\,\,267,4\end{array}\)

12,345 – 6,78 = 5,565

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,345}\\{6,78}\end{array}} \\\,\,\,\,\,\,5,565\end{array}\)

345,6 – 234,5 = 111,1

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,6}\\{234,5}\end{array}} \\\,\,\,\,\,111,1\end{array}\)

5,12 – 1,234 = 3,886

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5,12}\\{\,\,\,1,234}\end{array}} \\\,\,\,\,\,\,3,886\end{array}\)

134,2 – 67,8 = 66,4

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{134,2}\\{\,\,67,8}\end{array}} \\\,\,\,\,\,\,66,4\end{array}\)

67,89 – 23,4 = 44,49

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,\,67,89}\\{23,4}\end{array}} \\\,\,\,\,\,\,\,44,49\end{array}\)

167,9 – 78,9 = 89

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{167,9}\\{78,9}\end{array}} \\\,\,\,\,\,89\end{array}\)

123,56 – 56,78 = 66,78

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{123,56}\\{\,\,56,78}\end{array}} \\\,\,\,\,\,\,66,78\end{array}\)

456,7 – 345,1 = 111,6

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,7}\\{345,1}\end{array}} \\\,\,\,\,\,111,6\end{array}\)

23,67 – 7,89 = 15,78

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,67}\\{\,\,7,89}\end{array}} \\\,\,\,\,15,78\end{array}\)

189,4 – 89,12 = 100,28

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,4}\\{\,\,\,\,89,12}\end{array}} \\\,\,\,\,\,100,28\end{array}\)

5,678 – 2,34 = 3,338

\[\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,5,678}\\{2,34}\end{array}} \\\,\,\,\,\,\,\,3,338\end{array}\]