Respostas

2014-03-16T15:35:15-03:00
(4-8)-{[7+(+2-4)-(-5-13)]-1}=
-4-{[7+(-2)-(-18)]-1}=
-4-{[7+(-2)+18]-1}=
-4-{[7-2+18]-1}=
-4-{[23]-1}=
-4-{23-1}=
-4-22= -26
2 5 2