Respuestas

2013-04-15T03:08:19+02:00

2R +2 = S

 

2R + 2 = 12

 

2R = 10

 

R = 10/2

 

R=5

2013-04-15T05:47:59+02:00

se multiplican 12x2x2 =48 te va a servir :)