1 . 设向量
,
均为非负实数,入
.那么,
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f58c0303bcafc4d26233ad80bd0da40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01fccdc711b3e154c0f6cf88f105355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039f18afced411b2f9802d544f12554d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e32068a26ac5b49762b22356fb6b48.png)
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2 . 设
,令
,
,证明:对任何正整数n,有
.①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1510639120a1883e66f13794a9df9179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57bd57ae11e8ba6d5f329814ea6ae38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97909dd7ffe8c3941798129c9ab81a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abece478d06e6f32167bbce0ac3ef30e.png)
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3 . 设函数
的定义域是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eb8bd5080e4cf3e3bead55a5b70033.png)
对于下列四个命题:
(1)若
为奇函数,则
也为奇函数;
(2)若
为周期函数,则
也为周期函数;
(3)若
为单调递减函数,则
为单调递增函数;
(4)若方程
有实根,则方程
也有实根,
其中,正确的命题共有个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eb8bd5080e4cf3e3bead55a5b70033.png)
对于下列四个命题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d227791735377cb0c5644bd895fe4c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d227791735377cb0c5644bd895fe4c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d227791735377cb0c5644bd895fe4c.png)
(4)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/801d492de7ae12be2bf576f25c4f1ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e44284cb19805a584880a686ac3df9.png)
其中,正确的命题共有个
A.1 | B.2 | C.3 | D.4 |
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4 . 设a为实数,两条抛物线
与
有四个交点
(1)求a的取值范围;
(2)证明这四个交点共圆,并求该圆圆心的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263c2df4f4312b38903d48189b3bef53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d21130714686d23efad3a9ddae43a7.png)
(1)求a的取值范围;
(2)证明这四个交点共圆,并求该圆圆心的坐标.
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5 . 设
的周长为12,内切圆半径为1.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
A.![]() | B.![]() |
C.![]() | D.以上结论均不对 |
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6 . 方程
共有( )个不同的实根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc71ce4fa20ce5b51d61c33143db55a1.png)
A.0 | B.1 | C.2 | D.3 |
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7 . 设
、
、
、
均为实数,满足
.则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36999ec429ad943169809a949fe12aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2132b4e7b27acdd454f4d0b741890f43.png)
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8 . 设复数
.则
的值为__________ (用数学作答).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d70f81eb83937490c4ebb6d9a9fb0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cd38a1ff38977756c5b6af8371b70a.png)
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2014高三·天津·竞赛
9 . 设函数
,证明:
(1)当
时,
;
(2)若数列
满足
,则数列
递减,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887878406cf6cb0389ff7d45129f5918.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9d189d2ade2eb7ea55b8ebfa51c56d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36270e0f17e1f9128b670491a04c7d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2beb081ae289ae8d192f39312a3437ef.png)
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