题目
题型:不详难度:来源:
(3).(选修4—1 几何证明选讲)如图,已知
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-32411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-10651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-68405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-65202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-10651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-10651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-39271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-90313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011319-92899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011319-81061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011318-10651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011319-41615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011319-98921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011320-86505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011320-99740.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011320-74004.png)
解析
核心考点
试题【(3).(选修4—1 几何证明选讲)如图,已知是圆的切线,为切点,过做圆的一条割线交圆于、两点,为弦的中点,若圆心在∠的内部,则∠+∠的度数为: 】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011306-87655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011307-60999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011307-73355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011307-17226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011307-73355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011306-87655.png)
B.(不等式选讲)若关于
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011307-69369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011308-80219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011308-80334.png)
C.(几何证明选讲)如图圆
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011308-67149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011308-83751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011308-67149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011309-44974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011309-57083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011309-72819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011258-40507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011258-33677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011259-36644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011259-96456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011259-91638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011259-49154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011259-56541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011300-58881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011300-11383.png)
(I) 求证:Δ
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011300-36762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011300-83895.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011301-15198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011301-79185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011301-17570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011301-64022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011249-69177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011249-69524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-54451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-42680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-98403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-23106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-75447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-54451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-10277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-60782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011250-98403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-61657.png)
(I) 写出直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-75447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-60782.png)
(Ⅱ)试判定直线
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-75447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011251-60782.png)
如图所示,
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011237-50912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011237-93420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011238-44162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011238-93627.png)
过点
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011237-93420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011238-21574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011239-73206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011239-29462.png)
线与
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011239-48445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011237-93420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011239-56175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011240-55525.png)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011240-45553.png)
(II)求
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011240-33239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011240-28297.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011231-53489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011231-67532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011232-78844.png)
(2)(几何证明选讲)如图,在半径为2的⊙O中,∠AOB=90°,D为OB的中点,AD的延长线交⊙O于点E,则线段DE的长为 。
![](http://img.shitiku.com.cn/uploads/allimg/20191108/20191108011232-69041.png)
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