Respuestas

2012-03-20T20:03:43+01:00

(a+3b-c)-(2b-a+3c)+(4c-3a+2b)= a + 3b - c - 2b + a - 3c + 4c - 3a + 2b =

= -a + 3b 

2012-03-20T20:16:34+01:00

(a+3b-c)-(2b-a+3c)+(4c-3a+2b)=

a+3b-c-2b+a-3c+4c-3a+2b=

-a+3b