Tính giá trị biểu thức 3/5 + 2/7 - 4/5 =

\(\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{ = }}\begin{array}{*{20}{c}}3\\\hline{35}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline2\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}7\\\hline{12}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline6\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{10}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{11}\\\hline{20}\end{array}\)

\(\begin{array}{*{20}{c}}7\\\hline{10}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{11}\\\hline{20}\end{array}\)

\[\begin{array}{*{20}{c}}7\\\hline{10}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}3\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}3\\\hline{20}\end{array}\]

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline{15}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline7\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{14}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline7\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}7\\\hline{12}\end{array}\)

\(\begin{array}{*{20}{c}}9\\\hline{10}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{20}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}3\\\hline{20}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline8\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline9\end{array}{\rm{ + }}\begin{array}{*{20}{c}}{25}\\\hline{27}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{37}\\\hline{27}\end{array}\)

\(\begin{array}{*{20}{c}}7\\\hline{12}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{24}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{11}\\\hline{24}\end{array}\)

\[\begin{array}{*{20}{c}}{11}\\\hline9\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline8\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{67}\\\hline{72}\end{array}\]

\(\begin{array}{*{20}{c}}3\\\hline7\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}2\\\hline{21}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline{42}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline{12}\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline8\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ = }}\begin{array}{*{20}{c}}5\\\hline{24}\end{array}\)

\(\begin{array}{*{20}{c}}{13}\\\hline{30}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{15}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{30}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}2\\\hline5\end{array}\)

\(\begin{array}{*{20}{c}}7\\\hline8\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}3\\\hline{16}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{24}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{35}\\\hline{48}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline6\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{18}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{13}\\\hline{36}\end{array}\)

\(\begin{array}{*{20}{c}}{11}\\\hline{14}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline7\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{28}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{19}\\\hline{28}\end{array}\)

\[\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{10}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}1\\\hline{20}\end{array}\]

\(\begin{array}{*{20}{c}}4\\\hline9\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{18}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ = }}0\)

\(\begin{array}{*{20}{c}}{19}\\\hline7\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{14}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{16}\\\hline7\end{array}\)

\(\begin{array}{*{20}{c}}{13}\\\hline{18}\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}5\\\hline{36}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{72}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}{43}\\\hline{72}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline7\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}2\\\hline{21}\end{array}{\rm{ + }}\begin{array}{*{20}{c}}1\\\hline{42}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}9\\\hline{14}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{ }} + {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} - {\rm{ }}\begin{array}{*{20}{c}}9\\\hline{70}\end{array}{\rm{ = }}\begin{array}{*{20}{c}}5\\\hline{21}\end{array}\)