1 . 给出下列四个命题:其中所有正确命题的序号为
①中,是成立的充要条件;
②已知锐角
满足
,则
的最大值是
;
③将
的图象绕坐标原点O逆时针旋转角
后第一次与y轴相切,则;
④若函数
为R上的奇函数,则函数的图象一定关于点
成中心对称.
①中,是成立的充要条件;
②已知锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2cb357f48364ac47fd8a92d635c107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03005d17bf564371ad29fea41f5c650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821309f088a175c00dc0f4828334503d.png)
③将
![](https://img.xkw.com/dksih/QBM/2015/1/16/1571965939204096/1571965945004032/STEM/b301cdaa80dd49899b5d0865a7e0c237.png)
![](https://img.xkw.com/dksih/QBM/2015/1/16/1571965939204096/1571965945004032/STEM/2df32e6bc7fe486885c4cadbb9122d20.png)
④若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb839865d03d7bb6ee20032d370c2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b3620056971f56c0740a9e40fea990.png)
A.①②③ | B.②④ | C.①③④ | D.①②④ |
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2 . 判断正误(正确的填“正确”,错误的填“错误”)
(1)存在
,使
成立.( )
(2)对任意
,
都成立.( )
(3)
等价于
.( )
(4)
能根据
直接展开.( )
(1)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6623d852c5fe0db989d684a066d5c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d2f9432be56b93f02b8e70abc44b952.png)
(2)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6623d852c5fe0db989d684a066d5c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1b5d73b152462339f78eebd046724d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1b5d73b152462339f78eebd046724d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3c629310922cddc1e965db64d29b04a.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4f56d2fae12faa375cc066cbb099c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ccd021b476bebc123dae9005ee394.png)
您最近一年使用:0次