(请在下列三题中任选一题作答,如果多做,则按所做的第一题评分)
A.(不等式选做题)若不等式
对任意
恒成立,则a的取值范围是_________ .
B.(几何证明选做题)如图,
,且AB=6,AC=4,AD=12,则AE=_________ .
![](https://img.xkw.com/dksih/QBM/2014/6/5/1571758980046848/1571758985633792/STEM/7a4a433e665a45b9afe7f6444bd28f0a.png?resizew=208)
C.(坐标系与参数方程选做题)直角坐标系xOy中,以原点为极点,x轴的正半轴为极轴建极坐标系,设点A,B分别在曲线C1:
(θ为参数)和曲线C2:ρ=1上,则|AB|的最小值为_________ .
A.(不等式选做题)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcdff4bca388119d91ea8f6ad005e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29aef458f2367b76432719f6f56275d8.png)
B.(几何证明选做题)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a87a5d9af7b61ea4bf9bfc104d6c9cb.png)
![](https://img.xkw.com/dksih/QBM/2014/6/5/1571758980046848/1571758985633792/STEM/7a4a433e665a45b9afe7f6444bd28f0a.png?resizew=208)
C.(坐标系与参数方程选做题)直角坐标系xOy中,以原点为极点,x轴的正半轴为极轴建极坐标系,设点A,B分别在曲线C1:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c9f7fa5e7f4c79e7e93514385dbb93.png)
更新时间:2016-12-03 01:34:45
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