Cách làm cho bạn:
$\frac{4}{5}:\frac{4}{7}=\frac{4}{5}\times \frac{7}{4}=\frac{28}{20}=\frac{7}{5}$
$\frac{9}{5}:\frac{3}{10}=\frac{9}{5}\times \frac{10}{3}=\frac{90}{15}=\frac{6}{1}$
$\frac{1}{6}:\frac{1}{3}=\frac{1}{6}\times \frac{3}{1}=\frac{3}{6}=\frac{1}{2}$
$\frac{1}{9}:\frac{1}{6}=\frac{1}{9}\times \frac{6}{1}=\frac{6}{9}=\frac{2}{3}$
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