Question

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

Answer 1

(-2/2 +1/2)-(-1/6+4/6)
(-1/2)-(+3/6)
-3/6-3/6
-6/6
-1

Answer 2

(-1+1/2) - ( -1/6 + 2/3) 

( -2/2 + 1/2 ) - ( -1/6 + 4/6 ) 

( -1/2 ) - (  3/6 ) 

( -1/2) - ( 1/2 ) 

-1/2 - 1/2 

- 2/2 = - 1                  ok