[tex]\frac{10}{7} +\frac{5}{3} = \frac{10*3}{7 * 3} + \frac{5*7}{3*7} =\frac{30}{21} +\frac{35}{21} = \frac{30 +35 }{21} = \frac{65}{21}[/tex]
[tex]\frac{7}{8} +\frac{8}{10} = \frac{7 *5}{8*5} +\frac{8*4}{10*4} = \frac{35}{40} +\frac{32}{40} = \frac{35 + 32}{40} = \frac{67}{40}[/tex]
[tex]\frac{5}{2} +\frac{0}{6} = \frac{5*3}{2*3} +\frac{0*1}{6*1} = \frac{15}{6} +\frac{0}{6} = \frac{15 + 0}{6} = \frac{15}{6} = \frac{5*3}{2*3} =\frac{5}{2} \\[/tex]
En espérant avoir été utile !