a)
[tex] \frac{5}{2} \div \frac{3}{4} [/tex]
[tex] \frac{5}{2} \times \frac{4}{3} [/tex]
[tex] = \frac{10}{3} [/tex]
b)
[tex] \frac{3}{4} \div \frac{8}{10} [/tex]
[tex] \frac{3}{4} \times \frac{10}{8} [/tex]
[tex] = \frac{15}{16} [/tex]
c)
[tex] \frac{5}{2} \div \frac{8}{10} [/tex]
[tex] \frac{5}{2} \times \frac{10}{8} [/tex]
[tex] = \frac{25}{8} [/tex]
Espero ter ajudado
