题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083428-27654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083428-65794.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-18411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-54186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083434-42872.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-30142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-95158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-89279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-95687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-62036.png)
答案
解析
试题分析:(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-18411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083429-54186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083434-42872.png)
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-30142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-50598.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-35332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-79219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083437-77336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083437-77992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083437-46207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
(3) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-95158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083437-28787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083438-14273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083438-63578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083438-67116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083438-74764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083438-61447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-72323.png)
(4) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083435-89279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-95687.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083439-39934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083439-87125.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083439-80460.png)
所以可得
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083436-62036.png)
点评:本题的考点是数列与三角函数的综合,主要考查三角函数的化简,考查新定义三角函数的性质,解题的关键是一一判断,我们一定要有耐心进行化简求值。
核心考点
举一反三
①存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-44564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-86115.png)
②函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-36142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083417-88501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-57791.png)
③函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-20362.png)
④已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-31544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083418-96820.png)
其中正确的命题的个数为
(1)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083408-76569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083408-36057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-84658.png)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-86982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-43540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-14481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-86938.png)
(3)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083409-14481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-72769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-41784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-42237.png)
(4)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083410-64368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083411-95093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083411-74481.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083347-79751.png)
②函数y=sin(2x+
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083347-31237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-75756.png)
③将函数y=cos(2x-
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-86522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-86522.png)
④函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-60709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083348-16520.png)
其中正确的命题的序号是 .
①命题“若
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083329-12780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083329-19956.png)
②“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083329-27378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083329-74553.png)
③已知命题
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083330-40100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083330-36097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083330-44411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083330-53937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083331-71675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083331-84220.png)
④“
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083331-43043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083331-49029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102083332-72557.png)
其中正确的有 。
A.命题“若m > 0,则方程x2+x-m=0有实数根”的逆否命题为:“若方程x2+x-m=0无实数根,则m≤0”. |
B.“x=1”是“x2-3x + 2=0”的充分不必要条件. |
C.若![]() |
D.对于命题p:![]() |
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