1 . 若
,当
时,
,则下列不等式中正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e863ea4f1e8af63d06ad88a235a48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b73abfe4bc26b1ded680d7abb1a2cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c22c5360f845d6685f28cc25ede6e5.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
2 . 集合
,
,若
,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5c905c79545e75d187c3c358271cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1703dfeaddd9ea09a848b2962abef94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知
的导函数是
,记![](https://img.xkw.com/dksih/QBM/2011/9/1/1570299330371584/1570299335344128/STEM/2bd00ae35ddd47958a3c44e206ed7eb4.png)
则
![](https://img.xkw.com/dksih/QBM/2011/9/1/1570299330371584/1570299335344128/STEM/ee68ee1bac10444294aba5e21f7134cd.png)
![](https://img.xkw.com/dksih/QBM/2011/9/1/1570299330371584/1570299335344128/STEM/68cc01a5a47645eea8315b11e51fd652.png)
![](https://img.xkw.com/dksih/QBM/2011/9/1/1570299330371584/1570299335344128/STEM/2bd00ae35ddd47958a3c44e206ed7eb4.png)
![](https://img.xkw.com/dksih/QBM/2011/9/1/1570299330371584/1570299335344128/STEM/34aa1ebbffb74c2b8cab1e0404ae00c9.png)
A.A>B>C | B.A>C>B | C.B>A>C | D.C>B>A |
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