题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075157-80247.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-83569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-85624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-71390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-88839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-63496.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-75656.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-37233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075200-36641.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075200-42915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075200-60052.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075200-15292.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-85624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-71390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-88839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-63496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075201-56725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075201-65370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075200-15292.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075201-98618.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075201-56725.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-47783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-75656.gif)
(II)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075201-40332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075202-45948.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075202-97237.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075202-62383.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075202-34868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075204-71391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075204-19362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075204-51036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075204-90413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075205-58316.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075205-86910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075205-81427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075206-95373.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075158-88839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075159-63496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075206-65315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075206-82605.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075206-75621.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075144-98924.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075144-45350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075145-33764.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075145-45423.gif)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075145-79174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075145-71014.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-18091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-45245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-59695.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-18091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-59695.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075146-45926.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-57519.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-16117.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-16117.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-84675.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-96293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-96614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-34431.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-22907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-44657.gif)
(I)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-61980.gif)
(II)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075137-28030.gif)
(III)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075137-84998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075137-36656.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075136-22907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075137-74956.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075129-23795.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075129-41788.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075129-86037.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075129-26294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075129-50380.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075130-28246.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075130-47079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075130-47166.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075130-24248.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075131-25155.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075116-20249.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-90557.gif)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-83171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-37862.gif)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-40313.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-81116.gif)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075118-99296.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075118-40534.gif)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075118-80063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075118-56069.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075119-71789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075117-81116.gif)
其中正确的命题序号是 ▲ .
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075106-57323.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075107-60110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075106-57323.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075107-82029.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075107-63950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075108-60143.gif)
求证:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075108-83983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075108-67071.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075108-32502.gif)
(Ⅱ)平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075109-12846.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075109-32201.gif)
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