Respostas

2014-03-08T16:55:51-03:00
130 + 620 - 720 + (1308 - 654) = 
130 + 620 - 720 + 654 = 
750 - 720 + 654 =
30 + 654 =
684

2014-03-08T16:59:36-03:00
130+620-720(1308-654)=
130+620-720+654=
750-720+654=
30+654=
684