1 . 已知
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00155ff582c3afb64aa04059da42f434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b18a8a94d9bfcb19890f670a487d8d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9448bf1d6136b3a108e7ea60506ad39.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
2 . 已知函数
,函数
的图象经过点
且
的最小正周期为
.
(1)求函数
的解析式;
(2)若
对任意
恒成立,求实数
的取值范围;
(3)将函数
图象上所有的点向下平移1个单位长度;再将函数图象上所有点的横坐标变为原来的2倍,纵坐标不变;再将图象上所有的点的横坐标不变,纵坐标变为原来的
倍,得到函数
图象,令函数
,区间
且
满足:
在
上至少有30个零点,在所有满足上述条件的
中,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59367b579947f59b02b89ecef003a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1df13d788d09ce422a8fc355c2183e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67425ec29e7d2aed1f87a08f67eaa314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37440b57fe2ffc13f2a873e38f55d29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ed174193e60a8acedb4a5c5b7e0fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b281d7484ff444ea3a28bc5fa78913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3452a36b11f569e1f59d7f37fb7b8d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
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