1 . 选考题(请考生在A、B、C三题中任选一题作答,如果全选,则按A题结果计分)
A.已知函数
,
.若不等式
的解集为R,则
的取值范围是 .
B.在直角坐标系
中,以O为极点,x轴正半轴为极轴建立极坐标系,曲线C1的极坐标方程为
,曲线C2的参数方程为
(
为参数,
),则C1与C2有 个不同公共点.
C.已知C点在⊙O直径BE的延长线上,CA切⊙O于A点,若AB=AC,则
.
A.已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc61868afdd4ca3b21604f210456a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54cfdace00901347c8cc83b650fd731e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1587c9984a12dbc1565d8c8b44255cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
B.在直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e8e458b5efbae75bb54c6a5e699190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226faa9a54de1a3ebcd73c31c84381f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e44693550179ddaca2a57c7a1c2694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1bd28da79d86e474d7368db255317bd.png)
C.已知C点在⊙O直径BE的延长线上,CA切⊙O于A点,若AB=AC,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5e00b7e3ee4b70170f98045b958d35.png)
![](https://img.xkw.com/dksih/QBM/2015/4/15/1572074090708992/1572074096115712/STEM/b8b4f4e8b8ee4d20883d1021e78a669a.png)
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