题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054735-21545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054735-36703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-60667.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-56060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-37784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-43730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054737-79786.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054737-14903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054737-25933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054737-57935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-66836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-58809.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-47617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-26668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-58809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-19916.png)
解析
(2)根据
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-48605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-80568.png)
求出
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054740-24897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-58809.png)
(1)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-60667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054740-12838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-43730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054740-68492.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054736-56060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054740-16698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054741-88536.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054741-13869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054741-44642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054741-54757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054742-36664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-47617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-26668.png)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054742-14726.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054742-62517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054742-23271.png)
∵当
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054737-57935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-66836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054743-14400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054740-24897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054743-75725.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-58809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054743-34817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054743-41104.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054738-58809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054739-19916.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054509-72189.png)
A.3 | B.0 | C.0或3 | D.0或1或3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054451-51999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054359-79423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054359-74230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054359-56576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054325-57917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054325-33530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054325-64765.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054159-13976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054159-74338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002054159-13976.png)
A.第四象限 | B.第三象限 | C.第二象限 | D.第一象限 |
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