Resposta :
[tex] \frac{10}{7} \div \frac{3}{8} [/tex]
[tex] = \frac{10 \times 8}{7 \times 3} = \frac{80}{21} = 3 \frac{17}{21} [/tex]
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[tex] \frac{12}{9} \div \frac{3}{5} [/tex]
[tex] = \frac{12 \times 5}{9 \times 3} = \frac{60}{27} [/tex]
[tex] = \frac{20 \times 3}{9 \times 3} = \frac{20}{9} = 2 \frac{2}{9} [/tex]