Question

Resolva:  [ 1 + (1/5 - 2) : 3] : (2/3 - 1) =

Answer 1

1/5 - 2 = 1/5 - 10/5 = -9/5
2/3 - 1 = 2/3 - 3/3 = -1/3

[1+(-9/5):3]:(-1/3) = 
[1+(-9/5)*(1/3)]*(-3/1) = 
[1-9/15]*(-3) = 
[15/15 - 9/15]*(-3) = 
[6/15]*(-3) = 
-18/15 = 
-18:3 / 15:3 = 
-6/5