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∠A.＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD
∠A=∠D AB=DC ∠ACB=∠DBC AC=BD
∠A=∠D AB=DC ∠ACB=∠DBC AC=BD
AB=DC，AC=DB AB=DC，∠ABC=∠DCB BO=CO，∠A.=∠D AB=DC，∠DBC=∠ACB
AB=DC，AC=DB AB=DC，∠ABC=∠DCB BO=CO，∠A=∠D AB=DC，∠DBC=∠ACB
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD
∠A.＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD 
∠A＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD
∠A.＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD
AB=DC，AC=DB AB=DC，∠ABC=∠DCB BO=CO，∠A.=∠D AB=DC，∠DBC=∠ACB
∠A＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD
∠A.＝∠D AB＝DC ∠ACB＝∠DBC AC＝BD 
,
AB=CD，AC=BD AB=CD，∠ABC=∠BCD ∠ABC=∠DCB，∠A.=∠D AB=CD，∠A.=∠D.
＝∠D.＝90°当添加条件（ ）时不能证出△ABC≌△DCB A. AB＝CD ∠ABC＝∠DCB ∠AOB＝∠DOC OB＝OC 
∠A=∠D AB=DC ∠ACB=∠DBC AC=BD
AB=DC，AC=DB AB=DC，∠ABC=∠DCB BO=CO，∠A.=∠D AB=DC，∠DBC=∠ACB
AB=DC，AC=DB AB=DC，∠ABC=∠DCB BO=CO，∠A.=∠D AB=DC，∠A.=∠D.
AB=DC，AC=DB ∠A.=∠D.，∠ABC=∠DCB BO=CO，∠A.=∠D AB=DB，AC=DC 
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD 
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