Tính rồi rút gọn: 5/4 : 3/2

a) \(\frac{5}{4}:\frac{3}{2} = \frac{5}{4} \times \frac{2}{3} = \frac{{5 \times \bcancel{2}}}{{2 \times \bcancel{2} \times 3}} = \frac{5}{6}\)

\(\frac{4}{7}:\frac{6}{5} = \frac{4}{7} \times \frac{5}{6} = \frac{{2 \times \bcancel{2} \times 5}}{{7 \times 3 \times \bcancel{2}}} = \frac{{10}}{{21}}\)

b) \(\frac{{12}}{7}:\frac{6}{9} = \frac{{12}}{7} \times \frac{9}{6} = \frac{{\bcancel{6} \times 2 \times 9}}{{7 \times \bcancel{6}}} = \frac{{18}}{7}\)

\(\frac{4}{9}:\frac{6}{9} = \frac{4}{9} \times \frac{9}{6} = \frac{{\bcancel{2} \times 2 \times \bcancel{9}}}{{\cancel{9} \times \bcancel{2} \times 3}} = \frac{2}{3}\)