\(=4\frac{2}{5}+2\frac{3}{7}+5\frac{4}{7}-2\frac{2}{5}\)
\(=\frac{22}{5}+\frac{17}{7}+\frac{39}{7}-\frac{12}{5}\)
\(=\left(\frac{22}{5}-\frac{12}{5}\right)+\left(\frac{17}{7}+\frac{39}{7}\right)\)
\(=2+8\)
\(=10\)
\(4\frac{2}{5}+2\frac{3}{7}+5\frac{4}{7}-2\frac{2}{5}\)
\(=\left(4\frac{2}{5}-2\frac{2}{5}\right)+\left(5\frac{4}{7}+2\frac{3}{7}\right)\)
\(=2+8\)
\(=10\)
\(\left(4\frac{2}{5}+2\frac{3}{7}\right)+\left(5\frac{4}{7}-2\frac{2}{5}\right)\)
\(=\left(4\frac{2}{5}-2\frac{2}{5}\right)+\left(2\frac{3}{7}+5\frac{4}{7}\right)\)
\(=2+\left(2+5+\frac{3}{7}+\frac{4}{7}\right)\)
\(=2+8=10\)
\(\left[4\frac{2}{5}+2\frac{3}{7}\right]+\left[5\frac{4}{7}-2\frac{2}{5}\right]\)
\(=\left[\frac{22}{5}+\frac{17}{7}\right]+\left[\frac{39}{7}-\frac{12}{5}\right]\)
\(=\frac{22}{5}+\frac{17}{7}+\frac{39}{7}-\frac{12}{5}\)
\(=\frac{22}{5}-\frac{12}{5}+\frac{17}{7}+\frac{39}{7}\)
\(=2+8=10\)