题干
如图，在△ABC中，点D，E分别在边AB，AC上，∠AED=∠B，射线AG分别交线段DE，BC于点F，G，且
=
．
| A |
| D |
| A |
| C |
| D |
| F |
| C |
| G |
| A |
| D |
| A |
| C |
| D |
| F |
| C |
| G |
