2019高二下·全国·专题练习
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1 . 用综合法证明:如果
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9edf4b46071de185410242fa0af190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ecfac3cf74c67808886e7841cb9c39.png)
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2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c83d55bbc1e9eb4ee895ce58c275d73.png)
(1)若函数
的图像在公共点P处有相同的切线,求实数m的值和P的坐标;
(2)若函数
的图像有两个不同的交点M、N,求实数m的取值范围;
(3)在(2)的条件下,过线段MN的中点作x轴的垂线分别与
的图像和
的图象交于S、T点,以S点为切点作
以T为切点作
的切线
,是否存在实数m,使得
?如果存在,求出m的值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c83d55bbc1e9eb4ee895ce58c275d73.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47579adc1d920db4b4a6af53f2a8f837.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47579adc1d920db4b4a6af53f2a8f837.png)
(3)在(2)的条件下,过线段MN的中点作x轴的垂线分别与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd330acca8e17f5ff9aca1f0f312df50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c198a6b9ef7b2eba4e0c9bbd7590ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd330acca8e17f5ff9aca1f0f312df50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea5c8fe935beac660eda538e59cd43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a5d6aeeed1250e42abd1fb455c45ac.png)
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3 .
等差数列
的前
项和为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d869b202733c43df36075af3732515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b6877ef38ec149100206854cff21f6.png)
(1)求
以及![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
,证明数列
中不存在不同的三项成等比数列
等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d869b202733c43df36075af3732515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b6877ef38ec149100206854cff21f6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4867dfd2b1fa71e386275fe0fed234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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