Respuestas

2014-01-16T21:28:27+01:00
 9/21 - 3.(/21+8/21) - (3/21+/21) =
9/21- 3 ( 449/21 ) - ( 444/21 ) =
9/21 - 1347/21 - 44/21 =
9-1347-444/21 = -1782