Question

efetue as multiplicações e divisões
$\frac{ 3}{8} \times ( \frac{ - 2}{5} )$
$( - \frac{4}{5} ) \times ( - \frac{1}{2} )$
$\frac{3}{5} \div \frac{2}{3}$
$\frac{5}{6} \div ( \frac{ - 1}{2} )$
​

Answer 1

Explicação passo-a-passo:

1)

$\dfrac{3}{8} \times - \dfrac{2}{5}$

$- \dfrac{6 {}^{ \div 2} }{40 {}^{ \div 2} } {}^{ }$

-3/20

2)

$- \dfrac{4}{5} \times - \dfrac{1}{2}$

$\dfrac{4}{5} \times \dfrac{1}{2}$

$\dfrac{4 {}^{ \div 2} }{10 {}^{ \div 2} }$

2/5

3)

$\dfrac{3}{5} \div \dfrac{2}{3}$

$\dfrac{3}{5} \times \dfrac{3}{2}$

9/10

4)

$\dfrac{5}{6} \div - \dfrac{1}{2}$

$\dfrac{5}{6} \times - \dfrac{2}{1}$

$- \dfrac{10 {}^{ \div 2} }{6 {}^{ \div 2} }$

-5/3

Answer 2

Explicação passo-a-passo:

$a) \frac{3}{8} \times \frac{ - 2}{5} = \frac{3 \times - 2}{8 \times 5} = \frac{ - 6}{40} = \frac{ - 3}{20}$

$b) - \frac{4}{5} \times - \frac{1}{2} = \frac{4}{10} = \frac{2}{5}$

$c) \frac{3}{5} \div \frac{2}{3} = \frac{3}{5} \times \frac{3}{2} = \frac{9}{10}$

$d) \frac{5}{6} \div \frac{ - 1}{2} = \frac{5}{6} \times \frac{2}{ - 1} = - \frac{10}{6} = - 5/3$