Explications étape par étape:
[tex] \frac{7}{8} - \frac{ - 5}{3} = \frac{21}{24} + \frac{4 0 }{24} = \frac{61}{24} [/tex]
[tex] \frac{ - 8}{15} - \frac{7}{6} = \frac{ - 16}{30} - \frac{35}{30} = \frac{ - 51}{30} = - \frac{17}{10} [/tex]
[tex] \frac{ - 3}{10} + \frac{14}{10} + \frac{15}{10} - \frac{9}{8} = \frac{13}{5} - \frac{9}{8} = \frac{104}{40} - \frac{45}{40} = \frac{59}{40} [/tex]
