[tex]a = \frac{5}{24} + \frac{3}{24} \\ a = \frac{8}{24} \\ a = \frac{8 \times 1}{8 \times 3} \\ a = \frac{1}{3} [/tex]
[tex]b = \frac{7}{4} + \frac{2}{3} \\ b = \frac{7 \times 3}{4 \times 3} + \frac{2 \times 4}{3 \times 4} \\ b = \frac{21}{12} + \frac{8}{12} \\ b = \frac{29}{12} [/tex]
[tex]c = 8 - \frac{7}{3} \\ c = \frac{8 \times 3}{3} - \frac{7}{3} \\ c = \frac{24}{3} - \frac{7}{3} \\ c = \frac{17}{3} [/tex]
Je ne vois pas le D
