Question

alguem sabe a resposta?​

Answer 1

Resposta:

a)  $\frac{83}{30}$

b)  $\frac{45}{7}$

Explicação passo-a-passo:

$(\frac{2}{3} +\frac{-1}{2})+(\frac{-3}{-1}+\frac{-2}{5})\\(\frac{4-3}{6})+(\frac{15-2}{5})\\\frac{1}{6}+\frac{13}{5} \\\frac{5+78}{30} \\\frac{83}{30} ou 2,766...$

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·$(\frac{2}{-1}+\frac{4}{-2})$·$(\frac{2}{-1}+\frac{1}{7}+\frac{3}{-1})$

$(\frac{4+4}{-2})$·$(\frac{-14+1-21}{7})$

$(-\frac{8}{2})$·$(-\frac{34}{7})$

$\frac{-56-34}{14}$

$\frac{90}{14}$ (divide os dois por 2)

$\frac{45}{7}$