Respuestas

2012-10-18T04:57:06+02:00

 

 

23 mn + 11mn + 9mn - 18mn - 11mn + 2mn + 3mn =

 

 

23 mn + 11mn + 9mn + 2 mn +3 mn - 18 mn - 11mn =

 

48 mn - 29 mn = 19 mn