名校
1 . 已知
,若存在
使得集合
中恰有3个元素,则
的取值不可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50018097e45cc243c743ea3759a5796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1505ffc15f3755c9f069844458380d96.png)
(1)将
化为
的形式,并写出其最小正周期和图象对称轴方程,并判断函数的奇偶性(不需证明);
(2)若三角形三边
满足
所对为B,求B的范围;
(3)在(2)的条件下,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1505ffc15f3755c9f069844458380d96.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184f65c41ba3f59ad9b9276e61cb7cd5.png)
(2)若三角形三边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1d0ed0b099f12771f535cdb8c531b1.png)
(3)在(2)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2b9f4a56eddb8729daedaa14205852.png)
您最近一年使用:0次