Respuestas

2014-02-19T21:42:34+01:00
1- (7+5)+(13-4)-(17+3)+(18-9)=10
2- 19+15-18-10+4-7+9=12
3- 2.7-5.4+3.6-2-11+13=0.9
4- (8-2).3-2.(5+4)+3.(6-1)=90
5- (11-4).5-4.(6+2)+4.(5-3)-2.(8+6)=1652
6- 40/5.5+6/2.3+4-5.2/10=13.3614229249
7- (5.4.3)/(15-3)+18-(11-5).3=42

espero que te sirva salu2