Respuestas

2012-11-20T16:14:39+01:00

6/21 + 10/21 + 23/21 + 4/21  =  (6 + 10 + 23 + 4) / 21 = 43 / 21

 

13/8 - 3/8 - 5/8 -1/8 = (13 - 3 - 5 -1) / 8 = 4/8 = 1/2

 

( 8/9 ) / (4/3) = ( 8/9 ) . (3/4) = 24/36 = 2/3

 

dejar puntitos no cuesta nada xD