Cách làm cho bạn:
$\frac{7}{9}:2=\frac{7}{9}:\frac{2}{1}=\frac{7}{9}\times \frac{1}{2}=\frac{7}{18}$
$\frac{1}{3}:4=\frac{1}{3}:\frac{4}{1}=\frac{1}{3}\times \frac{1}{4}=\frac{1}{12}$
$\frac{3}{4}:6=\frac{3}{4}:\frac{6}{1}=\frac{3}{4}\times \frac{1}{6}=\frac{3}{24}$
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