Respuestas

2012-04-05T19:11:18+02:00

13-(-13)-(10-(-12)9)

13+26-(10+12)9

13+26-(22)9

13+26-198 =159

2012-04-05T20:49:36+02:00
13-(14-27)-(10-(11-23) 9= = 13-14+27-(10-11+23)9 = -1+27-10+11-23+9 = 13