1 . 如图,已知
是
与x轴的两个交点 ,
为直线上的动点 ,
与
的另一个交点分别为
.证明 :直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f57bf36e92fae170161eca953aa767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6369be9a574f40b54b894b41f3d89c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e85daaf3da68c34df2e93ac7f01381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/45d53db4-fdf8-44d8-bf26-5b673caa3ac8.png?resizew=179)
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2 . 六名大学毕业生到三个用人单位应聘.若每个单位至少录用其中一人 ,则不同的录用情形的种数是 __________ .
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3 . 过动点
作圆:
的切线
,其中
为切点,若
(
为坐标原点),则
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc6513e7cf46aac4fd44d9f52ffff94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9b8629823993c2c0a95901052adc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac35b1e8a952aac4f4cdaaf02d868d04.png)
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2017-05-04更新
|
1619次组卷
|
5卷引用:2018年全国高中数学联赛河北省预赛 高三试题
4 . 已知二次函数
.
则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf46ec5fbe3216054ca57820cfc7726.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd72e5e8c6bd7754ad84108c49cfff9.png)
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5 . 正三棱柱
的各条棱长均为3,长为2的线段
的一个端点
在
上运动,另一端点
在底面
上运动. 则
的中点
的轨迹(曲面)与正三棱柱共顶点
的三个面所围成的几何体的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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6 . 已知函数
.
(1)若曲线
在点
处的切线
与
有且只有一个公共点,求
的值;
(2)求证:函数
存在单调递减区间
,并求出单调递减区间的长度
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b75cd1cc3b26d8e1f3184c5f0defc7.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd817a1014876a72ad1971548ed6f52c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1b6f209d1a805437046ca6ef79dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371cbba672a1a8a4412aa0bc4100f5cd.png)
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7 . 已知关于
的不等式
有实数解. 则实数
的取值范围是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa82ecd54910a6c2313dab266387c49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 函数
的图像的对称中心为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103f8db4ae2f19916fa101f9e202512c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 如图,已知椭圆
过点
,两个焦点分别为
,
,
为坐标原点,平行于
的直线
交椭圆
于不同的两点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/5a8c4882-262e-44a2-8bf3-488c644341bc.png?resizew=176)
(1)求
面积的最大值;
(2)证明:直线
、
与
轴围成一个等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d23fc512ad69a2d5919ce690407704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256d2411b58ea71a0584c84144aee1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5973fe67568caf975b1cef998a363227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/5a8c4882-262e-44a2-8bf3-488c644341bc.png?resizew=176)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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10 . 已知函数
的反函数是
,且
. 则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c348ab2106eea479e635e3832cdf8072.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c09c5c89b0c2a92f8c4b70e69b0eada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87acb883fe6dd6cb459c033bf9bdb71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b957ecadd8fc8ebad382b316c54def93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c348ab2106eea479e635e3832cdf8072.png)
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