在△ABC中,AB=AC,点P为△ABC所在平面内一点,过点P分别作PE∥AC交AB于点E,PF∥AB交BC于点D,交AC于点F.
![](https://img.xkw.com/dksih/QBM/2019/1/27/2127621715181568/null/STEM/237faec8ca584a13bacd3723df76cc76.png?resizew=360)
(1)如图1,若点P在BC边上,此时PD=0,易证PD,PE,PF与AB满足的数量关系是PD+PE+PF=AB;当点P在△ABC内时,先在图2中作出相应的图形,并写出PD,PE,PF与AB满足的数量关系,然后证明你的结论;
(2)如图3,当点P在△ABC外时,先在图3中作出相应的图形,然后写出PD,PE,PF与AB满足的数量关系(不用说明理由).
![](https://img.xkw.com/dksih/QBM/2019/1/27/2127621715181568/null/STEM/237faec8ca584a13bacd3723df76cc76.png?resizew=360)
(1)如图1,若点P在BC边上,此时PD=0,易证PD,PE,PF与AB满足的数量关系是PD+PE+PF=AB;当点P在△ABC内时,先在图2中作出相应的图形,并写出PD,PE,PF与AB满足的数量关系,然后证明你的结论;
(2)如图3,当点P在△ABC外时,先在图3中作出相应的图形,然后写出PD,PE,PF与AB满足的数量关系(不用说明理由).
2012·江苏无锡·一模 查看更多[3]
更新时间:2016-12-05 08:53:16
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