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1 . 已知Rt△ABC中,CD是斜边AB上的高,BE是角平分线并且与CD交于F,CH⊥EF,垂足为H,延长CH与AB交于G.
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180013395902464/2181526744260609/STEM/f6e41111c6ee45219076d0203b7050e1.png?resizew=265)
(1)求证:
;
(2)若AC=2BC,求证EA=5FD.
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180013395902464/2181526744260609/STEM/f6e41111c6ee45219076d0203b7050e1.png?resizew=265)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de0f9cba1248d3dd476fd1c6f0afe6d.png)
(2)若AC=2BC,求证EA=5FD.
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2 . 如图,已知圆上是弧
=弧
,过点
的圆的切线
与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/014cd8ff813446af83f6e21cde406a19.png)
(1)求证:
;
(2)求证:
.
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/7d65ebc7b7cb4d42ab78dccad8b65a2a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/516e8049bde640599240fd0abba02168.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/aeec79396c7d4b3ebc730d7f7a64e422.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/6e97d076626642bbb2df96af70aafa09.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/5b8192d9ed8a4a97a348afbbdbe10cab.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/4b5250e0e5444d18b7eaf14119250494.png)
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/014cd8ff813446af83f6e21cde406a19.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/1ec2d60f578a4231a91f135de7ea952b.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2016/5/19/1572642802843648/1572642809176064/STEM/e3284c8c2a784740a413232713c30349.png)
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