Resposta :
Resposta:
[tex] \frac{9}{7} - \frac{7}{9} [/tex]
[tex] = \frac{81}{63} - \frac{49}{63} [/tex]
[tex] = \frac{32}{63} [/tex]
Resposta:
[tex] \frac{9}{7} - \frac{7}{9} [/tex]
[tex] = \frac{81}{63} - \frac{49}{63} [/tex]
[tex] = \frac{32}{63} [/tex]