Respostas

2014-03-17T20:30:51-03:00
10+(-10+5)-(1+1-4)=
10+(-5)-(-2)+
10-5+2=
7
e a outraé:
2-(-1-5+8)+(7-30-4)= 2-(2)+(-27)= 2-2-27= -27
2014-03-17T20:32:53-03:00