Respostas

2014-07-02T01:53:09-03:00
1(+13+3):(-10+5)-(-1+8)=
(16)÷(-5) – (7)= 16 ÷ 12 =
16/12 simplificando por 4
 4/3

2(-8:(+4-2)-(-12):(-5+7)=2

2(-8÷(2) – (-12)÷(2)=2
2(-8÷2+12÷2)=2
2(-4+6)=2
2(2)=2
4 = 2
2