證明:∵∠ADB=180°-∠BDE,∠ADC=180°-∠CDE,
∴∠ADB=∠ADC.
∵在△ADB和△ADC中,
∠ABD=∠ACD,AD=AD,∠ADB=∠ADC,
∴△ADB≌△ADC.
∴BD=CD.
如圖,在△ABC中,點(diǎn)E在BC上,點(diǎn)D在AE上,已知∠ABD=∠ACD,∠BDE=∠CDE.求證:BD=CD.
如圖,在△ABC中,點(diǎn)E在BC上,點(diǎn)D在AE上,已知∠ABD=∠ACD,∠BDE=∠CDE.求證:BD=CD.
![](http://hiphotos.baidu.com/zhidao/pic/item/b2de9c82d158ccbf9a8230bb1ad8bc3eb1354171.jpg)
![](http://hiphotos.baidu.com/zhidao/pic/item/b2de9c82d158ccbf9a8230bb1ad8bc3eb1354171.jpg)
數(shù)學(xué)人氣:688 ℃時間:2019-08-17 23:56:46
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