trens articulats

trens articulats de un sol eish.
trens articulats de dos eishus.


(1/2)+(1/2)+(1/2)+(1/2) = 1+1


1+( (1/2)+(1/2) )+( (1/2)+(1/2)+(1/2)+(1/2) ) = 1+1+1+1


rodalies un pis y dos pisos


( (1/2)+(1/2) )+( (1/2)+(1/2) )+( (1/2)+(1/2) ) = 1+1+1