Respostas

2014-04-15T13:34:09-03:00
80-5•(28-6•4)+6-3•4
=80-5•52+6-3•4
=8-260+6-12
=-258
2 2 2
2014-04-15T13:34:47-03:00
80-5.4+6-3.4
80 - 20 + 6 - 12
60 + 6 - 12
66 - 12 = 54 
1 5 1