BC=1/2·AC=3
DC=1/2·CE=2
当点E在线段AC的延长线上时,
BD=BC+DC=3+2=5
当点E在线段AC上时,
BD=BC-DC=3-2=1
___________________
A B C D E
___________________
A E B D C
BC=1/2·AC=3
DC=1/2·CE=2
当点E在线段AC的延长线上时,
BD=BC+DC=3+2=5
当点E在线段AC上时,
BD=BC-DC=3-2=1
___________________
A B C D E
___________________
A E B D C