bonsoir
[tex]a = 2 + \frac{3}{4} + \frac{7}{6} \\ a = \frac{8}{4} + \frac{3}{4} + \frac{7}{6} \\ a = \frac{8 + 3}{4} + \frac{7}{6} \\ a = \frac{11}{4} + \frac{7}{6} \\ a = \frac{33}{12} + \frac{14}{12} \\ a = \frac{33 + 14}{12} \\ a = \frac{47}{12} [/tex]
[tex]c = ( \frac{8}{7} - \frac{2}{3} ) \times \frac{3}{7} \\ c = ( \frac{24}{21} - \frac{14}{21} ) \times \frac{3}{7} \\ c = \frac{24 - 14}{21} \times \frac{3}{7} \\ c = \frac{10}{21} \times \frac{3}{7} \\ c = \frac{10 \times 3}{21 \times 7} \\ c = \frac{30}{147} \\ c = \frac{10}{49} [/tex]
[tex]b = - 5 + 3 \times \frac{1}{4} \\ b = - 5 + \frac{3}{4} \\ b = - \frac{20}{4} + \frac{3}{4} \\ b = \frac{ - 20 + 3}{4} \\ b = - \frac{17}{4} [/tex]
