Respuestas

2012-02-29T07:04:03+01:00

1.) 5a-3b+c+(4a-5b-c)=5a-3b+c+4a-5b-c=9a-8b

2.) 8x-(15y+16z-12x)-(-13x+20y)-(x+y+z)=8x-15y-16z+12x+13x-20y-x-y-z=32x-36y-17z

3.) -(x-2y)-[{3x-(2y-z)}-{4x-(3y-2z)}]=-x+2y-[{3x-2y+z}-{4x-3y+2z}]=-x+2y-[3x-2y+z-4x+3y-2z]=-x+2z-3x+2y-z+4x-3y+2z=y+3z