作DG//AE∴∠ABC=∠DGC ∠E=∠EDG∵ 等边△ABC∴ ∠ABC=∠C∵ ∠ABC=∠DGC ∠ABC=∠C∴ ∠DGC=∠C ∴DG=CD∵ BE=CD ∴ DG=BE在△BEP和△GDP中∠E=∠EDG∠BPE=∠DPGBE=DG...