Respostas

2014-04-08T09:48:22-03:00
10-15-3+(5-7)+1
10-15-3+(-2) +1
10-15-3-2+1
11-20
-9
1 3 1
2014-04-08T09:51:10-03:00
10-15-3+(5-7)+1=10-15-3+(-2)+1=10-15-5+1=1.
1 1 1