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 =...

78,9 – 34,56 = 44,34

\(\begin{array}{l}\underline {-\begin{array}{*{20}{c}}{\,\,\,\,78,9}\\{34,56}\end{array}} \\\,\,\,\,44,34\end{array}\)

23,67 – 7,123 = 16,547

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,67}\\{\,\,\,\,7,123}\end{array}} \\\,\,\,\,\,16,547\end{array}\)

456,1 – 189,4 = 266,7

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,1}\\{189,4}\end{array}} \\\,\,\,266,7\end{array}\)

345,9 – 234,5 = 111,4

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,9}\\{234,5}\end{array}} \\\,\,\,\,111,4\end{array}\)

5,678 – 2,134 = 3,544

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5,678}\\{2,134}\end{array}} \\\,\,\,\,3,544\end{array}\)

134,56 – 67,89 = 66,67

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{134,56}\\{\,\,67,89}\end{array}} \\\,\,\,\,\,\,66,67\end{array}\)

189,2 – 89,56 = 99,64

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,2{\rm{ }}}\\{\,\,\,89,56}\end{array}} \\\,\,\,\,\,\,99,64\end{array}\)

12,34 – 4,123 = 8,217

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,34}\\{\,\,\,4,123}\end{array}} \\\,\,\,\,\,\,8,217\end{array}\)

67,8 – 23,45 = 44,35

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{67,8}\\{\,\,\,23,45}\end{array}} \\\,\,\,\,\,\,\,44,35\end{array}\)

456,7 – 345,6 = 111,1

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

23,456 – 5,12 = 18,336

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,456}\\{5,12}\end{array}} \\\,\,\,\,18,336\end{array}\)

345,1 – 167,8 = 177,3

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,1}\\{167,8}\end{array}} \\\,\,\,\,177,3\end{array}\)