Resposta:
a)
[tex] \frac{10}{5} \times \frac{9}{4} [/tex]
[tex]2 \times \frac{9}{4} [/tex]
[tex] \frac{9}{2} [/tex]
b)
[tex] \frac{6}{8} \times \frac{6}{7} [/tex]
[tex] \frac{3}{4} \times \frac{6}{7} [/tex]
[tex] \frac{3}{2} \times \frac{3}{7} [/tex]
[tex] \frac{9}{14} [/tex]
c)
[tex] \frac{3}{2} \times \frac{1}{9} [/tex]
[tex] \frac{1}{2} \times \frac{1}{3} [/tex]
[tex] \frac{1}{6} [/tex]
d)
[tex] \frac{1}{9} \times \frac{2}{4} [/tex]
[tex] \frac{1}{9} \times \frac{1}{2} [/tex]
[tex] \frac{1}{18} [/tex]
e)
[tex] \frac{5}{12} \times \frac{1}{8} [/tex]
[tex] \frac{5 \times 1}{12 \times 8} [/tex]
[tex] \frac{5}{96} [/tex]
f)
[tex] \frac{15}{7} \times \frac{10}{4} [/tex]
[tex] \frac{15}{7} \times \frac{5}{2} [/tex]
[tex] \frac{75}{14} [/tex]
g)
[tex] \frac{8}{10} \times \frac{5}{2} [/tex]
[tex] \frac{4}{2} [/tex]
[tex]2[/tex]
h)
[tex] \frac{6}{11} \times \frac{3}{4} [/tex]
[tex] \frac{3}{11} \times \frac{3}{2} [/tex]
[tex] \frac{9}{22} [/tex]
