这道初中数学的题目是:填空:已知,(如图)在△ABC中,BD为∠ABC的平分线,AB=BC,点P在BF上,PM⊥AD于M,PN⊥CD于N,求证:PM=PN证明:∵BD为∠ABC的平分线,∴∠ABD=∠CBD()在△ABD和△CBD中AB=CB (已知)________________BD=BD (公共边)∴△ABD≌△CBD( )∴___________( )又∵_________________...
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这道初中数学的题目是:填空:已知,(如图)在△ABC中,BD为∠ABC的平分线,AB=BC,点P在BF上,PM⊥AD于M,PN⊥CD于N,求证:PM=PN证明:∵BD为∠ABC的平分线,∴∠ABD=∠CBD()在△ABD和△CBD中AB=CB (已知)________________BD=BD (公共边)∴△ABD≌△CBD( )∴___________( )又∵_________________...