Bonjour,
[tex] - 3 \times \frac{20}{9} = - \frac{60}{9} = \frac{ - 3 \times 20}{3 \times 3} = - \frac{20}{3} [/tex]
[tex] \frac{12}{35} \times \frac{ - 49}{9} = \frac{ - 588}{315} = - \frac{28}{15} [/tex]
[tex] - \frac{4}{5} \times \frac{ - 3}{4} \times \frac{ - 10}{9} = \frac{12}{20} \times \frac{ - 10}{9} = \frac{ - 3}{5} \times \frac{10}{9} = - \frac{30}{45} = - \frac{10}{15} = - \frac{2}{3} [/tex]
[tex] \frac{2}{3} \times \frac{7}{ - 5} \times \frac{ - 12}{56} = \frac{14}{ - 15} \times \frac{ - 3}{14} = \frac{ - 3}{ - 15} = \frac{1}{5} [/tex]
