Resposta:

j) [tex](-\frac{4}{9}) . \frac{1}{2} = (-\frac{4}{18} )[/tex]

Resposta:

j)

[tex](-\dfrac{\not4^2}{9})\times\dfrac{1}{\not2}=-\dfrac{2}{9}[/tex]

k)

[tex](+\dfrac{5}{\not4})\times(-\dfrac{\not4}{11})=-\dfrac{5}{11}[/tex]

l)

[tex](+\dfrac{6}{10})\times(-\dfrac{1}{3})=-\dfrac{6}{30}=-\dfrac{1}{5}[/tex]

m)

calcula cancelando

[tex](-\dfrac{\not7}{\not2})\times(+\dfrac{\not3}{\not14_2})\times(-\dfrac{\not2}{\not3})=+\dfrac{1}{2}[/tex]