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∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠D.=∠C，∠BAD=∠ABC ∠BAD=∠ABC，∠ABD=∠BAC BD=AC，∠BAD=∠ABC AD=BC，BD=AC
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
∠ ＝∠ ，BD＝DCB.∠ADB＝∠ADC，BD＝DC C.∠B.＝∠C.，∠BAD＝∠CAD BD＝DC，AB＝AC
∠B=∠C，BD=DC ∠ADB=∠ADC，BD=DC ∠B=∠C，∠BAD=∠CAD BD=DC，AB=AC 
BD=DC， AB=AC ∠ADB=∠ADC，BD=DC ∠B.=∠C.，∠BAD=∠CAD ∠B.=∠C.，BD=DC
∠ ＝∠ ，BD＝DC B.∠ADB＝∠ADC，BD＝DC C.∠B.＝∠C.，∠BAD＝∠CAD BD＝DC，AB＝AC 
∠1=∠3 ∠2=∠3 ∠1=∠4 ∠3=∠4 
BD=DC，AB=AC ∠ADB=∠ADC，BD=DC ∠B.=∠C.，∠BAD=∠CAD ∠B.=∠C.，BD=DC 
∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
∠ =∠ ，BD=DCB.∠ADB=∠ADC，BD=DC C.∠B.=∠C.，∠BAD=∠CAD BD=DC，AB=AC
∠D=∠C，∠BAD=∠ABC ∠BAD=∠ABC，∠ABD=∠BAC BD=AC，∠BAD=∠ABC AD=BC，BD=AC
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC 
∠D=∠C，∠BAD=∠ABC ∠BAD=∠ABC，∠ABD=∠BAC BD=AC，∠BAD=∠ABC AD=BC，BD=AC
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