Question

Respondam por favor , questão de prova

Answer 1

Resposta:

a) 0.16

b) 9.231

c) -1,333...

Explicação passo-a-passo:

a)

$=(-1/3)\times(2/5)\div(-1/3)\times(2/5)$

$=\frac{-1}{3}\times\frac{\frac{2}{5}}{\frac{-1}{3}}\times\frac{2}{5}$

$=\frac{-1}{3}\times\frac{2}{5}\times\frac{3}{-1}\times\frac{2}{5}$

$=\frac{2}{5}\times\frac{2}{5}$

$=\frac{4}{25}$

$=0.16$

b)

$=(-9)\div(3/8-7/20-1)$

$=(-9)\div\left(\frac{3}{8}-\frac{7}{20}-1}\right)$

$=(-9)\div\left(\frac{15}{40}-\frac{14}{40}-\frac{40}{40}}\right)$

$=(-9)\div\left(\frac{15-14-40}{40}}\right)$

$=(-9)\div\left(\frac{-39}{40}}\right)$

$=-9\times\frac{40}{-39}$

$=\frac{-360}{-39}$

$=\frac{120}{13}$

$=9.231$

c)

$=(1-1/3)\div(1/2-1)$

$=(1-\frac{1}{3})\div(\frac{1}{2}-1)$

$=(\frac{3}{3}-\frac{1}{3})\div(\frac{1}{2}-\frac{2}{2})$

$=\frac{2}{3}\div\frac{-1}{2}$

$=\frac{2}{3}\times\frac{2}{-1}$

$= -\frac{4}{3}$

$=-1,333\hdots$