Question

qual o valor da expressão (1/3+1/4) sobre 1/2 -5/6

Answer 1

( 1/3 + 1/4) : (1/2 -5/6) =  
= (  4/12 + 3/12) : (3/6 - 5/6) =
 = ( 7/12 ) : ( - 2/6) =
 = 7/12 . ( - 6/2 ) =
 = 7/12 . ( - 3/1) =
 = - 21/ 12 =
 =  - 7 / 4