Respuestas

2013-08-14T17:33:20+02:00
a)(-7) + ( -15) + 10 + (-2) + 3 -5= -7-15+10-2+3-5= = 13-29=-16
b) -3 · [10 + 2 - (-7) ] - (4- 7 + 3)= -3·[10+2+7]-(7-7)=-3·19-0=-57