1 . 对1,2,3,4,5,6的任意2个全排列
和
,
的值可以是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc79b7b3c2ce9c244eccc84d969ca9a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48aca3e46d69316f98fe774b81e1a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a21a5d0039149ea3417e2c78efb52765.png)
A.161 | B.162 | C.172 | D.441 |
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解题方法
2 . 下列关于数列
的判断中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c530fb86c411d24da90638373538a2c.png)
A.对一切![]() ![]() |
B.对一切![]() ![]() |
C.对一切![]() ![]() ![]() ![]() |
D.对一切![]() ![]() ![]() ![]() |
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2023-04-06更新
|
497次组卷
|
3卷引用:2017年清华大学THUSSAT附加科目测试数学试题(二测)
2023高三·全国·专题练习
3 . 设
,对任意
,
,总存在
,使得
成立,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80027540415bd2b98c9be19e21b5f8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dd0914dc4d4c7f75710ff460a286fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365114c53aa12abda1004c8e4cb4ca0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3dd103e3af31eb7f568af33f867855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 设
,
(
为常数).若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6694500d0b3cd2784e4c9617d2d77861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ff6ff5c00396b7f7d50675d80a0844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57db73d5e95d0dda392d5af3a5cecaa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cb85820577e4c835a8d6a2f272ebd0.png)
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5 . 锐角三角形ABC中,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1753d72942b116096579b05decd2b378.png)
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6 . 已知x>0,y>0,且
,则x+2y的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51376dbee9c1fcebf4c93e4e55b1e6a1.png)
您最近一年使用:0次
2020-05-11更新
|
992次组卷
|
3卷引用:2019年全国高中数学联赛甘肃省预赛
7 . 设a,b,c∈(0,1],
为实数,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504819e52e43d1fae7fb261d4f809c02.png)
恒成立,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504819e52e43d1fae7fb261d4f809c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ff75538fd528697d98fa5ad61bba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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8 . 设正实数
满足
.记
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97587602696a9354913624e0ece634ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a7f940ddc5e709a7e6afea9011d3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bb8731f04bc525ef6a84721b2a2454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddf19ac4d3789f5964657b26cdbdb9c.png)
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9 . 设F是椭圆
的左焦点,过点F且斜率为正的直线与E相交于A、B两点,过点A、B分别作直线AM和BN满足AM⊥l,BN⊥l,且直线AM、BN分别与x轴相交于M和N.试求|MN|的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2350b54e88be27fe9aae210ed626c.png)
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