所有线段的长度和=AC+AD+AE+AB+CD+CE+CB+DE+DB+EB
=(AC+CD+DE+EB)+(AD+DB)+AB+AE+CE+CB
=AB+AB+AB+(AC+CE)+CE+CB
=3AB+(AC+CB)+2CE
=4AB+2CE
=48+8=56
所有线段的长度和=AC+AD+AE+AB+CD+CE+CB+DE+DB+EB
=(AC+CD+DE+EB)+(AD+DB)+AB+AE+CE+CB
=AB+AB+AB+(AC+CE)+CE+CB
=3AB+(AC+CB)+2CE
=4AB+2CE
=48+8=56