如图,Rt△ABC中,
,
于F,AD是∠BAC的平分线,
交AC于G,AD与BF交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/a59e8e4a-2a91-42d9-af9e-849174817b0d.png?resizew=175)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52bd7960a4596450a561a0a96c3fc30.png)
(2)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9878c5e478f74f221c5071a5141218a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/a59e8e4a-2a91-42d9-af9e-849174817b0d.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52bd7960a4596450a561a0a96c3fc30.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f850b2b1eb78b91f29159181648b2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7c4b31a26a5a44f98780cc54b6e676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70398ec19dbe88fb4d0e4a82c36a750.png)
21-22九年级上·河北石家庄·期末 查看更多[2]
更新时间:2022-07-26 12:28:14
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解答题-证明题
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适中
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【推荐2】(1)完成下面的填空:已知:如图,△ABC中,∠ACB=90°,CD⊥AB于点D,AF平分∠CAB交CD于E,交BC于F,求证:∠CEF=∠CFE
证明:∵∠ACB=90°(已知),∴∠CAF+∠ =90°( ).
∵CD⊥AB(已知),∴∠FAB+∠ =90°( )
∵AF平分∠CAB( ),∴∠CAF=∠FAB( )
∴∠ =∠ ( ),
∵∠CEF=∠ ( ),∴∠CEF=∠CFE( )
(2)请用不同于(1)的方法给予证明.
证明:∵∠ACB=90°(已知),∴∠CAF+∠ =90°( ).
∵CD⊥AB(已知),∴∠FAB+∠ =90°( )
∵AF平分∠CAB( ),∴∠CAF=∠FAB( )
∴∠ =∠ ( ),
∵∠CEF=∠ ( ),∴∠CEF=∠CFE( )
(2)请用不同于(1)的方法给予证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/7396fdc3-bc70-4e86-91c6-c0dc161b6709.png?resizew=155)
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解答题-证明题
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适中
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【推荐1】如图,□ABCD的对角线交于点O,点E在边BC的延长线上,且OE=OB,连接DE.
(1)求证:△BDE是直角三角形;
(2)如果OE⊥CD,试判断△BDE与△DCE是否相似,并说明理由.
(1)求证:△BDE是直角三角形;
(2)如果OE⊥CD,试判断△BDE与△DCE是否相似,并说明理由.
![](https://img.xkw.com/dksih/QBM/2017/9/27/1783134858199040/1784989462994944/STEM/e705d699ce8c43868825028516522b3e.png?resizew=171)
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解答题-问答题
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名校
【推荐1】如图,在
中,
,
平分
交
于点D,点F在
上,连接
,E为
的中点,
交于点G,连接
.
,求
的长;
(2)若点F在直线
上,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1975b83f18b2b98ca462fcef5eb95517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d7f93412a66f59338cc47c60b419c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402c0f9eecfcdf73f9e87ca82a6f2c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)若点F在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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