Exercice 1 :
a) 3 - [tex] \frac{4}{7} [/tex] + [tex] \frac{1}{2} [/tex] = [tex] \frac{42}{14} [/tex] - [tex] \frac{8}{14} [/tex] + [tex] \frac{7}{14} [/tex] = [tex] \frac{41}{14} [/tex]
b) [tex] \frac{5}{ \frac{3}{4} + \frac{1}{2} } [/tex] = [tex] \frac{5}{ \frac{3}{4} + \frac{2}{4} } [/tex] = [tex] \frac{5}{ \frac{5}{4} } [/tex] = 5 * [tex] \frac{4}{5} [/tex] = [tex] \frac{20}{5} [/tex] = 4
c) 3 - 4 * [tex] \frac{2}{7} [/tex] = 3 - [tex] \frac{8}{7} [/tex] = [tex] \frac{21}{7} [/tex] - [tex] \frac{8}{7} [/tex] = [tex] \frac{13}{7} [/tex]
