Question

Me ajudem (2/3 - 1/1) . (2/3 + 1/1)

Answer 1

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

resultado por extenso:
 Menos cinco sexto

Answer 2

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