题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-25237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-13741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-94992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-73501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-38930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-89954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030258-99189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-53051.png)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-25393.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-52066.png)
答案
解析
试题分析:(Ⅰ)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-13184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-11921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-72208.png)
(Ⅱ)证明
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-98652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-32791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-27965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-61842.png)
试题解析:(1)∵直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030301-38936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030301-94647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030301-63752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030302-69707.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030302-84072.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030302-42985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030301-94647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030302-67894.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-31661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-29303.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-14109.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-56923.png)
(2)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030259-11921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-46720.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030303-96951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-98652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-32791.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-27965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030300-61842.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-20837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-55054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-32258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-57525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-84782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030248-56258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-57525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030247-55054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030248-64010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030248-50314.png)
A.1 | B.![]() | C.2 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030240-44535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030240-87542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030240-63920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030240-17074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030241-84247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030241-35861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030241-32773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030241-88358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030242-99134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030242-80010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030242-81034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030230-36325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030230-86037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030231-56591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030231-93710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030231-10323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030231-90740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030232-20552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030232-13618.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030232-27837.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030232-10761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030223-51095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030223-69884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030224-97074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030224-39973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030223-69884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030224-77471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030224-27019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030223-69884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030225-54680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030225-14217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030225-24117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030216-19172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030216-55423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030217-63052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030217-18063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030216-55423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030217-93645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030217-56417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030217-76748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030218-77708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030218-80798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030218-20411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030218-43565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030219-29647.png)
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