Question

Qual o valor da expressão:

(1/2 - 1/5) - (5/6 + 2 1/3)

Answer 1

(1/2 - 1/5) - (5/6 + 2.1/3)
(1/2 - 1/5 = 10/2*1 - 10/5*1 / 10) - (5/6 + 1/6)
(1/2 - 1/5 = 5*1 - 50*1 / 10) - (6/6)
(1/2 - 1/5 = 5 - 50 / 10) - (1)
(-45/10) - 1
-4,5 -1
Resposta = -5,5

Answer 2

$(\frac{1}{2})-( \frac{5}{6}+ 2*\frac{1}{3})$

$mmc .de. 2E5 = 10$

$\frac{5-2}{10}= \frac{3}{10}$

agora o outro

$\frac{2}{1} * \frac{1}{3}= \frac{2}{3}$

$\frac{5}{6}+ \frac{2}{3}>mmc=6$

$\frac{5+2}{6}= \frac{7}{6}$

agora 

$\frac{3}{10}- \frac{7}{6}> mmc =30$

$\frac{3-7}{30}= \frac{-4}{30}$

simplificando fica 

$\frac{-2}{15}$