题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011822-68175.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011822-16487.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011823-17294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011823-64064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011822-97456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011823-65758.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011823-12902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011824-94721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011824-59660.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011824-36260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011824-62274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011825-82610.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011825-75912.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011825-36435.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011826-74722.gif)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011826-56254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011822-97456.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011826-60704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011822-97456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011826-37556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011827-48635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011827-30078.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011824-62274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011827-45032.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011827-59907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011828-57546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011828-21806.gif)
由(1),知
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011828-20053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011828-44722.gif)
由已知,有
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011829-81389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011829-71922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011829-86756.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011829-49564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011830-31088.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011830-84213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011830-56052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011830-38383.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011831-48278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011831-21810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011831-41286.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011831-43000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011832-71471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011832-67546.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011832-54081.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011833-43458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011826-37556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011833-98640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011833-80517.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011833-18180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011833-54894.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011834-41221.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011834-45736.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011834-93529.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011834-61299.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011835-80769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011829-81389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011835-53437.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011835-18846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011835-92575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011836-63491.gif)
解析
核心考点
试题【如图,是以为直径的上一点,于点,过点作的切线,与的延长线相交于点是的中点,连结并延长与相交于点,延长与的延长线相交于点.(1)求证:;(2)求证:是的切线;(3】;主要考察你对圆锥曲线性质探讨等知识点的理解。[详细]
举一反三
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011808-66967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011808-64574.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011808-63444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-60229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-60229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-46469.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-68085.jpg)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-95312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011809-56010.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011810-22958.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011810-65778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011810-57069.gif)
(Ⅲ)当平面
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011810-36491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011811-85925.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011808-64574.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011802-47517.gif)
如图,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011802-15510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011802-54348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011802-56037.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011803-40937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011803-38549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011803-60280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011803-23784.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011804-44463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011804-70845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011804-81661.gif)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011804-60265.gif)
(Ⅱ)证明:CE平分
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011803-38549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011758-12654.jpg)
(本小题满分10分)选修4-1:几何证明选讲
如图,A,B,C,D四点在同一圆上,AD的延长线与BC的延长线交于E点,且EC=ED.
(I)证明:CD//AB;
(II)延长CD到F,延长DC到G,使得EF=EG,证明:A,B,G,F四点共圆.
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011753-58768.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011753-74105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011753-18602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011753-96955.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011754-70748.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011754-85657.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011754-87059.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011754-34387.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011755-46395.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011744-70698.gif)
(Ⅰ)求证:BD平分∠ABC
(Ⅱ)若AB=4,AD=6,BD=8,求AH的长
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011745-28815.jpg)
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