1 . 函数
的单调递减区间是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be0ef42fcac290f927d7df36d4a52a5.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
2 . 已知函数
的导函数存在两个零点,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744c356cbfbecad11a096a3c2c41bd07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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3 . 若数列
相邻两项的和依次构成等差数列,则称
是“邻和等差数列”.例如,数列
,
为“邻和等差数列”.已知数列
是“邻和等差数列”,
是其前
项和,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27140692bd6cad765e4f98c8e074b8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c19d78707974fd26e6f36ee4239452b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec487bb058d7a21725af4eea93b71d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.png)
A.39700 | B.39800 | C.39900 | D.40000 |
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4 . 在某次英语四级考试中,若甲、乙、丙通过考试的概率分别为
,且
成等比数列,三人各自是否通过这次考试相互独立,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133529f221f5d04d56f203563567d313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133529f221f5d04d56f203563567d313.png)
A.![]() |
B.甲、乙都通过这次考试的概率为0.24 |
C.甲、丙都不通过这次考试的概率为0.12 |
D.乙、丙中至少有一人通过这次考试的概率为0.96 |
您最近一年使用:0次
5 . 设函数
的导函数为
的导函数为
的导函数为
.若
,且
,则
为曲线
的拐点.下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a00a7220fe1f1699aa32ea0c70a303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7cba7cd15304286a0f063cbd8010bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4ebc24433085ec7985fe753f7e5851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aa5809890eb4f90c99800530027ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e0da3107ae7d783e36310e2f28b10a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db00e106c7d08a76a7ba71ca5e63d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
A.曲线![]() | B.曲线![]() |
C.曲线![]() | D.曲线![]() |
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6 . 已知函数
.
(1)求不等式
的解集;
(2)求过点
且与曲线
相切的切线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56add7a397d2a4bbe9fc06028dd10d8f.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cc67e8c1402be68597c1d59b073bf4.png)
(2)求过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d55bed96da7c7f4ec234a17043310c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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7 . 若数列
为等比数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ ,数列
的前
项和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fe62f4c0059f9430ab76d68a07de7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67e70e2917641f28c4d0fc48ae2b49c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ad0ea22f971066249d9472c8fed67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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8 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cec1103dc9dea9f83af648f22fad066.png)
A.![]() |
B.![]() ![]() |
C.曲线![]() ![]() |
D.曲线![]() ![]() |
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9 . 某质点的位移
(单位:
)与时间
(单位:
)满足函数关系式
,则该质点的瞬时速度的最小值为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65502a7ea4d1ce6d6d8c720845c73e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c55c6ac7fe1758801b70fa48d7164c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53afeaf21f93091b71608d21540be239.png)
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10 . 设等比数列的前7项和、前14项和分别为2,8,则该等比数列的前28项和为( )
A.64 | B.72 | C.80 | D.92 |
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