Respuestas

2012-08-01T18:29:49+02:00

-2-(9-(6)-7)-1

-2-(9-6-7)-1

-2-(9-13)-1

-2-(-4)-1

-2+4 -1

1

2012-08-01T18:39:12+02:00

-2-[9-(4+2)-7]-1

-2-[9-6-7]-1

-2-[-4]-1

-2+4-1

R/ 1