Bonsoir,
[tex]1)\ a)\ \dfrac{5}{3}+\dfrac{2}{3}=\dfrac{7}{3}\\\\b)\ \dfrac{-4}{11}+\dfrac{9}{11}=\dfrac{5}{11}\\\\c)\ \dfrac{4}{7}+\dfrac{8}{7}=\dfrac{12}{7}\\\\d)\ \dfrac{-2}{5}+\dfrac{-4}{5}=\dfrac{-6}{5}[/tex]
[tex]2)\a)\ \dfrac{3}{13}-\dfrac{7}{13}=-\dfrac{4}{13}\\\\b)\ \dfrac{-7}{9}-\dfrac{4}{9}=-\dfrac{11}{9}\\\\c)\ \dfrac{-1}{17}-\dfrac{3}{4}=-\dfrac{4}{68}-\dfrac{51}{68}=-\dfrac{55}{68}\\\\d)\ \dfrac{7}{5}-\dfrac{-6}{5}=\dfrac{7}{5}+\dfrac{6}{5}=\dfrac{13}{5}[/tex]
