Question

(1/2-1/5)-(5/6+21/3)=

Answer 1

(1/2-1/5)-(5/6+21/3)= -7,53
(0,5-0,2)-(0,83+7)
0,3-7,83
-7,53

Answer 2

$(\dfrac{1}{2} - \dfrac{1}{5}) - (\dfrac{5}{6} + \dfrac{21}{3})$

Vamos resolver os parêntesis primeiro:

MMC do primeiro termo: 2 , 5 = 10

MMC do segundo termo: 6, 3 = 6

$(\dfrac{5 - 2}{10}) - (\dfrac{5 + 42 }{6}) \\ \\ \\ (\dfrac{3}{10}) - (\dfrac{47}{6})$

MMC de 10, 6 = 30

$(\dfrac{3}{10}) - (\dfrac{47}{6}) \ => \ \dfrac{9 - 235}{30} \\ \\ \\ \dfrac{-226}{30} \ \dfrac{\div}{\div} \ \ \dfrac{2}{2} = -\dfrac{113}{15}$