\(\left(\frac{4}{5}+\frac{1}{2}\right).\left(\frac{3}{13}-\frac{8}{13}\right)\)
\(=\left(\frac{8}{10}-\frac{5}{10}\right).\left(-\frac{5}{13}\right)\)
\(=\frac{3}{10}.\left(-\frac{5}{13}\right)\)
\(=-\frac{15}{130}=-\frac{3}{26}\)
\(\left(\frac{4}{5}+\frac{1}{2}\right).\left(\frac{3}{13}-\frac{8}{13}\right)\)
\(=\frac{13}{10}.\frac{-5}{13}=\frac{-65}{130}\)