题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-85557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-65404.png)
①图象
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-65404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-17518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-59609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081741-29662.png)
③函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-59609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-65404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081741-13413.png)
其中,正确命题的编号是____________.(写出所有正确命题的编号)
答案
解析
试题分析:将
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-17518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-85557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-65404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-17518.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081741-28317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081742-42579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081742-74118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-59609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081741-29662.png)
函数
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-85557.png)
将x=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081742-57063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081740-85557.png)
点评:典型题,正弦型函数图象和性质,是高考考查的重点内容之一,本题涉及到了函数的单调性、奇偶性以及图象的对称性,比较典型。
核心考点
试题【设函数的图象为,给出下列命题:①图象关于直线对称;②函数在区间内是增函数;③函数是奇函数;④图象关于点对称.其中,正确命题的编号是____________.(写】;主要考察你对四种命题等知识点的理解。[详细]
举一反三
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081630-35144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081630-67031.png)
‖AB‖=
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081630-10219.png)
①若点C在线段AB上,则‖AC‖+‖CB‖=‖AB‖;
②在△ABC中,若∠C=90°,则‖AC‖+‖CB‖=‖AB‖;
③在△ABC中,‖AC‖+‖CB‖>‖AB‖.
其中真命题的个数为
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081607-46808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081608-21432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081608-32757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081608-99312.png)
的是 ( )
A.当![]() ![]() ![]() ![]() |
B.当![]() ![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() |
①
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-34245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-48695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-15192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-47105.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-61226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-61226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-61226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-19482.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-34245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-34245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-64101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081600-66614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-64101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191102/20191102081601-64972.png)
其中正确命题的序号是 ( )
A.①⑤ | B.②③④ |
C.②③ | D.①④⑤ |
A.若x、y全为0,则x2+y2≠0 | B.若x、y不全为0,则x2+y2=0 |
C.若x、y全不为0,则x2+y2≠0 | D.若x、y不全为0,则x2+y2≠0 |
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