cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
\(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}-\frac{8}{9}+\frac{1}{6}\)
\(=\left(\frac{4}{6}+\frac{1}{6}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{17}{9}-\frac{8}{9}\right)\)
\(=\frac{5}{6}+2+1\)
\(=3\frac{5}{6}=\frac{7}{2}\)