题目内容：

如图四边形abcd是菱形,f是ab上一点df交ac于e求证角afd＝角cbe
 

优质解答

∵四边形ABCD是菱形∴∠ACB=∠ACD,BC=CD,EC=EC∴⊿BCE≌⊿DCE∴∠CDE＝∠CBE∵AB∥CD∴∠AFD＝∠CDE∴∠CDE＝∠CBE---------------------------------------------------------------------------------------------...