题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171419-83841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171419-82321.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171419-54656.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171419-34020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-87802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-75573.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-97570.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-10127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-10963.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171421-22018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171421-12804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171421-26444.gif)
则△
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171420-75573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171421-38623.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171422-10297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171422-20803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171422-47256.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171422-57735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-46529.gif)
原式
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-48803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-15048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-48803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-54608.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171423-48803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171424-18014.gif)
上式左-右
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171424-58855.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171424-94891.gif)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171424-10203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171424-31562.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171412-12634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171412-67458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171412-38784.gif)
用
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171412-95939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171413-82318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171413-85839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171359-14902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171359-21421.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171359-76035.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171359-32957.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171347-59410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171347-58705.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171347-36328.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171347-41850.gif)
上的两条切线,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171347-98771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171348-93070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171348-69143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171348-17241.gif)
(A)相交 (B)是异面直线 (C)平行 (D)可能是相交、平行或异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171335-66171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171336-92572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171336-92572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022171336-19385.gif)
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