Tính: 7/4 5/8

\(\frac{7}{4} \times \frac{5}{8} = \frac{{7 \times 5}}{{4 \times 8}} = \frac{{35}}{{32}}\)

\(\frac{{10}}{9}:\frac{3}{4} = \frac{{10}}{9} \times \frac{4}{3} = \frac{{10 \times 4}}{{9 \times 3}} = \frac{{40}}{{27}}\)

\(\frac{5}{7} \times 8 = \frac{5}{7} \times \frac{8}{1} = \frac{{5 \times 8}}{{7 \times 1}} = \frac{{40}}{7}\)

\(8:\frac{{15}}{7} = \frac{8}{1} \times \frac{7}{{15}} = \frac{{8 \times 7}}{{1 \times 15}} = \frac{{56}}{{15}}\)