Question

2 - ( -2/3 -1/4) + 0,1
( - 1 +1/2) - (1/6 + 2/3)
2 - [3/5 - ( -1/2 + 1/4)]

Answer 1

2/1 + 2/3 + 1/4 + 1/10 =
MMC = 60
( 120 + 40 + 15 + 6)/60 = 181/60  =3 inteiros 1/60 

( -1/1 + 1/2) - ( 1/6 + 2/3 )  = - 1/1 + 1/2 - 1/6 - 2/3 =
mmc = 6
( 6 + 3 - 1 - 4)/6 = 3/6 = 1/2 ***

2/1 - [ 3/5 - ( -1/2 + 1/4 )] =
2/1 - [ 3/5 - ( -2 + 1)/4)] =
2/1 - [ 3/5 - ( -1/4) ]=
2/1 - [ 3/5 + 1/4 ] =
2/1 - 3/5 - 1/4 = 
mmc = 20
( 40 - 12 - 5)/20 = 23/20 *** 1 int 3/20 ***