已知抛物线C:y1=a(x﹣h)2﹣1,直线l:y2=kx﹣kh﹣1.
(1)求证:直线l恒过抛物线C的顶点;
(2)当a=﹣1,m≤x≤2时,y1≥x﹣3恒成立,求m的最小值;
(3)当0<a≤2,k>0时,若在直线l下方的抛物线C上至少存在两个横坐标为整数的点,求k的取值范围.
(1)求证:直线l恒过抛物线C的顶点;
(2)当a=﹣1,m≤x≤2时,y1≥x﹣3恒成立,求m的最小值;
(3)当0<a≤2,k>0时,若在直线l下方的抛物线C上至少存在两个横坐标为整数的点,求k的取值范围.
更新时间:2020-01-29 16:20:34
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【知识点】 其他问题(二次函数综合)
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解答题-问答题
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解题方法
【推荐1】已知二次函数
.
(1)若该二次函数的图象经过点
和
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(2)若
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(1)若该二次函数的图象经过点
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(3)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b8e8cd1e8d008743aa747c690c765f.png)
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【推荐2】如图,拋物线
交
轴于点
、
,交
轴于点
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,
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(1)求抛物线的解析式;
(2)点
为抛物线第四象限的点,连接
交
轴于点
,若点
的横坐标为
,
的长为
,用含
的式子表示
的长;
(3)在(2)的条件下,点
在线段
上,
轴交抛物线于点
,以
为斜边在
的上方作等腰直角
,延长
交抛物线于点
,连接
,若
,
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的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
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(1)求抛物线的解析式;
(2)点
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(3)在(2)的条件下,点
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