Salut,
Ⓐ
[tex]\dfrac{3}{4} + \left(-\dfrac{2}{3} \right) = \dfrac{3}{4} - \dfrac{2}{3} =[/tex]
[tex]= \dfrac{9}{12} - \dfrac{8}{12} = \boxed{\dfrac{1}{12}}[/tex]
Ⓑ
[tex]- \dfrac{7}{18} - \dfrac{6}{9} + \dfrac{11}{36} = - \dfrac{14}{36} - \dfrac{24}{36} + \dfrac{11}{36} =[/tex]
[tex]= - \dfrac{38}{36}+ \dfrac{11}{36} = - \dfrac{27}{36} = \boxed{-\dfrac{3}{4}}[/tex]
Amicalement ㋡
