Выполните умножение: 1)6/7 * (4/7) 2) -4/7*7/9 3) -6 * (-5/24) 4)-6/19 * (-57) 5)9 3/5 * (-10/21)

$\frac{6}{7} \times \frac{4}{7} = \frac{6 \times 4}{7 \times 7} = \frac{24}{49}$.

$\frac{-4}{7} \times \frac{7}{9} = \frac{-4 \times 7}{7 \times 9} = \frac{-28}{63} = \frac{-4}{9}$.

$-6 \times \left(\frac{-5}{24}\right) = \frac{-6 \times -5}{24} = \frac{30}{24} = \frac{5}{4}$.

$\frac{-6}{19} \times (-57) = \frac{-6 \times -57}{19} = \frac{342}{19}$.

$9 \frac{3}{5} \times \frac{-10}{21} = \frac{48}{5} \times \frac{-10}{21} = \frac{48 \times -10}{5 \times 21} = \frac{-480}{105} = \frac{-16}{7}$.