Respuestas

2013-06-28T23:29:00+02:00
1) -(2 + 4 - 3 - 5) = -(6 - 8) = -(-2) = 2
2) 2 -(4 + 8 -3) = 2 - (12 - 3) = 2 - (9) = 2 - 9 = -7
3) 7 + 3 (4 + 2 - 5) = 7 + 3(6 - 5) = 7 + 3(1) = 7 + 3 = 10