Phép cộng phân số 3/9 + 2/9 =

\[\begin{array}{*{20}{c}}3\\\hline9\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{ = }}\begin{array}{*{20}{c}}5\\\hline9\end{array}\]

\[\begin{array}{*{20}{c}}1\\\hline8\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{ = }}\begin{array}{*{20}{c}}3\\\hline4\end{array}\]

\(\begin{array}{*{20}{c}}8\\\hline{15}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}4\\\hline{15}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}4\\\hline5\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline{13}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}7\\\hline{13}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}9\\\hline{13}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline{10}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}6\\\hline{10}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}9\\\hline{10}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline{12}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}6\\\hline{12}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{11}\\\hline{12}\end{array}\)

\(\begin{array}{*{20}{c}}9\\\hline{16}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}5\\\hline{16}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}7\\\hline8\end{array}\)

\[\begin{array}{*{20}{c}}3\\\hline{20}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}8\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{11}\\\hline{20}\end{array}\]

\(\begin{array}{*{20}{c}}{44}\\\hline{23}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{15}\\\hline{23}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{59}\\\hline{23}\end{array}\)

\[\begin{array}{*{20}{c}}9\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{11}\\\hline5\end{array}{\rm{ = 4}}\]

\[\begin{array}{*{20}{c}}{10}\\\hline9\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}8\\\hline9\end{array}{\rm{ = 2}}\]

\[\begin{array}{*{20}{c}}{51}\\\hline{25}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{21}\\\hline{25}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{72}\\\hline{25}\end{array}\]

\(\begin{array}{*{20}{c}}{22}\\\hline{15}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}8\\\hline{15}\end{array}{\rm{ = 2}}\)

\[\begin{array}{*{20}{c}}{17}\\\hline{12}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{11}\\\hline{12}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}7\\\hline3\end{array}\]

\(\begin{array}{*{20}{c}}{29}\\\hline{18}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{17}\\\hline{18}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{23}\\\hline9\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline{11}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}6\\\hline{11}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{10}\\\hline{11}\end{array}\)

\(\begin{array}{*{20}{c}}9\\\hline{16}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{65}\\\hline{16}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{37}\\\hline8\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}4\\\hline6\end{array}{\rm{ = }}\begin{array}{*{20}{c}}5\\\hline6\end{array}\)

\[\begin{array}{*{20}{c}}{18}\\\hline{30}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{11}\\\hline{30}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{29}\\\hline{30}\end{array}\]

\(\begin{array}{*{20}{c}}8\\\hline{20}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}9\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{17}\\\hline{20}\end{array}\)

\(\begin{array}{*{20}{c}}6\\\hline{35}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{23}\\\hline{35}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{29}\\\hline{35}\end{array}\)

\(\begin{array}{*{20}{c}}{13}\\\hline{21}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}5\\\hline{21}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}6\\\hline7\end{array}\)

\[\begin{array}{*{20}{c}}{15}\\\hline{41}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{21}\\\hline{41}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{36}\\\hline{41}\end{array}\]

\(\begin{array}{*{20}{c}}{15}\\\hline7\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}8\\\hline7\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{23}\\\hline7\end{array}\)

\(\begin{array}{*{20}{c}}{27}\\\hline{19}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{14}\\\hline{19}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{41}\\\hline{19}\end{array}\)

\(\begin{array}{*{20}{c}}{40}\\\hline{27}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{20}\\\hline{27}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{20}\\\hline9\end{array}\)

\[\begin{array}{*{20}{c}}4\\\hline{29}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{11}\\\hline{29}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{15}\\\hline{29}\end{array}\]

\(\begin{array}{*{20}{c}}{34}\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{33}\\\hline5\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{67}\\\hline5\end{array}\)

\(\begin{array}{*{20}{c}}{14}\\\hline{11}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}9\\\hline{11}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{23}\\\hline{11}\end{array}\)

\[\begin{array}{*{20}{c}}{35}\\\hline{22}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{15}\\\hline{22}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{25}\\\hline{11}\end{array}\]

\(\begin{array}{*{20}{c}}7\\\hline{27}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{10}\\\hline{27}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{17}\\\hline{27}\end{array}\)

\[\begin{array}{*{20}{c}}{15}\\\hline{16}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{19}\\\hline{16}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{17}\\\hline8\end{array}\]

\(\begin{array}{*{20}{c}}{16}\\\hline{75}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{32}\\\hline{75}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{16}\\\hline{25}\end{array}\)

\(\begin{array}{*{20}{c}}{11}\\\hline{99}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{10}\\\hline{99}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{21}\\\hline{99}\end{array}\)

\(\begin{array}{*{20}{c}}{15}\\\hline{52}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}9\\\hline{52}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}6\\\hline{13}\end{array}\)

\(\begin{array}{*{20}{c}}{16}\\\hline{69}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}7\\\hline{69}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline3\end{array}\)

\(\begin{array}{*{20}{c}}{13}\\\hline{40}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}7\\\hline{40}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline2\end{array}\)

\[\begin{array}{*{20}{c}}{19}\\\hline{84}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{29}\\\hline{84}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}4\\\hline7\end{array}\]

\(\begin{array}{*{20}{c}}{13}\\\hline{56}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{15}\\\hline{56}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline2\end{array}\)

\[\begin{array}{*{20}{c}}{32}\\\hline{49}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}4\\\hline{49}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{36}\\\hline{49}\end{array}\]

\(\begin{array}{*{20}{c}}3\\\hline{55}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{71}\\\hline{55}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{74}\\\hline{55}\end{array}\)

\(\begin{array}{*{20}{c}}{21}\\\hline{100}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{37}\\\hline{100}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{29}\\\hline{50}\end{array}\)

\[\begin{array}{*{20}{c}}{65}\\\hline{137}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{48}\\\hline{137}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{113}\\\hline{137}\end{array}\]

\(\begin{array}{*{20}{c}}{71}\\\hline{149}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{53}\\\hline{149}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{124}\\\hline{149}\end{array}\)

\[\begin{array}{*{20}{c}}{42}\\\hline{130}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}{39}\\\hline{130}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{81}\\\hline{130}\end{array}\]