题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022602-57328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022603-84698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022603-79164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022603-42893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022604-47922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022604-61470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022604-62378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022604-10806.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022606-29943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022606-82895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022606-85689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022606-36865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022607-89682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022607-44214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022607-55503.png)
令∠BPC=2x,则
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022607-28776.png)
在△PBC中,显然有:0°<∠BPC<180°,∴0°<2x<180°,∴0°<x<90°,
∴cosx、sinx都是正数,∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022608-30510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022608-11513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022608-19773.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022556-20079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022557-14112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022557-82732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022557-80079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022557-30339.png)
A.内心 | B.重心 | C.外心 | D.垂心 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022552-87094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022552-15138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022552-26344.png)
A.有相同起点的向量 | B.平行向量 |
C.模相等的向量 | D.相等向量 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022544-69463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022544-23255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022544-92547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022544-55659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022544-95093.png)
(1)判断
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022545-14915.png)
(2)能否以
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022545-72935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022545-59592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022536-82768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022536-47019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022537-49161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022537-25822.png)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022536-82768.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022537-68886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022537-29801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022538-95217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022538-59045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022538-59045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022537-68886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022530-90757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022530-61769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022531-61749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022531-11152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022531-90634.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022532-74975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022532-20964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105022532-17666.png)
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