1 . 过抛物线
的对称轴上的定点
,作直线
与抛物线相交于
、
两点.
(1)证明:
、
两点的纵坐标之积为定值;
(2)若点
是定直线
上的任一点,设三条直线
,
,
的斜率分别为
,
,
,证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2f0d9868a1a561f6415369cbf5ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c25e28fd001fbf07c3f3ea2e89a35a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ff131c92aa9e10f696d374216cdcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95cefb160c373407a49e3a8aee1a228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0721e40e4c6929a24c54d2035c4014a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1241589f386e0091d54a3c97fd338c.png)
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2020-07-01更新
|
269次组卷
|
2卷引用:2020届河北省新乐市第一中学高三下学期高考冲刺数学试题
名校
2 . 设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7c55c670b75d058ccc00282a874516.png)
(1)当
时,求不等式
的解集;
(2)当
时,
恒成立,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7c55c670b75d058ccc00282a874516.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b60302d80d8613675bb3dd5c03164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba802ed7061d6a890adb6f60b142ffe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9cc215a10aaeb7d12c5c971725b21bb.png)
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2019-12-23更新
|
422次组卷
|
4卷引用:2020届河北省衡水中学高三下学期一调考试数学文科试题
2020届河北省衡水中学高三下学期一调考试数学文科试题广东省广州市广东实验中学2019-2020学年高三第三次阶段考试文科数学试题(已下线)2020届高三3月第01期(考点13-14)(文科)-《新题速递·数学》2020届湖南省长沙市雅礼中学高三第六次月考数学(文)试题
解题方法
3 . 斜率为
的直线
与抛物线
交于
、
两点,
为坐标原点.
(1)当
时,求
;
(2)若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2799abb64fd7bfce9dfa7228aa460564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419504736c4934f6e0df4114c3743944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424ed86470fdf3959563a6880abc4820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f463601ad38ed539a3961e5284bd87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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2018-10-29更新
|
431次组卷
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2卷引用:【市级联考】河北省唐山市2019届高三9月摸底考试数学(理)试题
12-13高三上·河北保定·期末
4 . 已知各项全不为零的数列
的前
项和为
,且
,其中
.
(1)求数列
的通项公式;
(2)在平面直角坐标系内,设点
,试求直线
斜率的最小值(
为坐标原点).
![](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/c0e7577e0b1d791d1570029019234d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)在平面直角坐标系内,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b483a96309fd3cecb74c0a5825400da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9123b1c8cb0bbaca44e8464bee03678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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