Respostas

2013-10-21T16:13:13-02:00
20 - 9 + 10 - 21 +100 - 50
11 + 10 - 21 + 100 - 50
21 - 21 + 100 - 50
0 + 100 - 50
100 - 50 = 50
1 5 1