Explications étape par étape:
a)
[tex] \frac{1}{8} + \frac{7}{12} = \frac{3}{24} + \frac{14}{24} = \frac{17}{24} [/tex]
b)
[tex] \frac{5}{4} - \frac{3}{5} = \frac{25}{20} - \frac{12}{20} = \frac{13}{20} [/tex]
c)
[tex] \frac{7}{5} - ( - \frac{9}{5} ) = \frac{16}{5} [/tex]
d)
[tex] \frac{8}{24} + ( \frac{ - 7}{3} ) = \frac{8}{24} + ( \frac{ - 56}{24} ) = \frac{ - 48}{24} [/tex]
e)
[tex] \frac{3}{4} - \frac{7}{9} = \frac{27}{36} - \frac{28}{36} = \frac{ - 1}{36} [/tex]
f)
[tex] \frac{4}{7} - ( \frac{ - 2}{3} ) = \frac{12}{21} - ( \frac{ - 14}{21} ) = \frac{26}{21} [/tex]
