Respostas

2014-04-21T11:26:32-03:00
50-3x { 7+8:4 - [20 -3x -4]}
50-3x { 7+8:4- [ 17 - 4]}
50 -3x {7 +8:4 -13}
50- 3x {7 + 2- 13}
50- 3x {9 -13}
50 - 3x - 4
47x -4
44
2014-04-21T14:52:10-03:00
50-3x{7+8/4-[20-3x(9-5)]}
50-3x{7+8/4-[20-3x4]}
50-3x{7+8/4-[20-12]}
50-3x{7+8/4-8}
50-3x{7+2-8}
50-3x1
50-3=
47
3 4 3