Respuestas

2012-08-10T23:13:20+02:00

la resolucionn seria asi:

                                         2a+4b-6c-6a+9b-6c

        

                                                      -4a+13b-12c

 

                                                       -4(a+3c) +13c

2012-08-10T23:54:22+02:00

2(a+2b-3c)-3(2a-3b+2c)

Solucion

2a+4b-6c - 6a+9b-6c

-4a+13b-12c