△ABC中,AB=AC,O是△ABC内一点,且OB=OC.请说明AO⊥BC的理由.“因 AB=AC得( 角ABC=角A)所以角ADB=角ADC=90度”不太懂
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![△ABC中,AB=AC,O是△ABC内一点,且OB=OC.请说明AO⊥BC的理由.“因 AB=AC得( 角ABC=角A)所以角ADB=角ADC=90度”不太懂](/uploads/image/z/9621628-52-8.jpg?t=%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2CO%E6%98%AF%E2%96%B3ABC%E5%86%85%E4%B8%80%E7%82%B9%2C%E4%B8%94OB%3DOC.%E8%AF%B7%E8%AF%B4%E6%98%8EAO%E2%8A%A5BC%E7%9A%84%E7%90%86%E7%94%B1.%E2%80%9C%E5%9B%A0+AB%3DAC%E5%BE%97%28+%E8%A7%92ABC%3D%E8%A7%92A%EF%BC%89%E6%89%80%E4%BB%A5%E8%A7%92ADB%3D%E8%A7%92ADC%3D90%E5%BA%A6%E2%80%9D%E4%B8%8D%E5%A4%AA%E6%87%82)
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