Respuestas

2013-04-10T21:40:02+02:00

25:5-[(4-9)x3+(9-12):3]

 

25/5-[(4-9)x3+(9-12)/3]

5 - [(-5)x3 + (-3)/3]

5 - [ -15  + (-1)]

5 - [ -16]

5 + 16

21

 

2013-04-10T22:21:01+02:00