已知
为抛物线
上两点,以
为切点的抛物线的两条切线交于点
,设以
为切点的抛物线的切线斜率为
,过点
的直线斜率为
,则以下结论正确的有__________ .(填序号)
①
成等差数列;②若点
的横坐标为
,则
;③若点
在抛物线的准线上,则
是钝角三角形;④若点
在直线
上,则直线
恒过定点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993e32909bbca986031b33787ae29b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1dc007e36c78ab98df4cd2383b4c5d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0d9964a2c0a2b7d7604fcc51e19e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd00466aada5c657e8cbe10afd38dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e212cdbfba6610bc55df2c1a737407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
更新时间:2023-06-03 08:47:54
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【推荐1】已知
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【推荐2】如图,从点
(0,0)作x轴的垂线交于曲线
于点
(0,1),曲线在点Q1处的切线与x轴交于点
.再从
作x轴的垂线交曲线于点
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点的坐标为
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…
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,
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解题方法
【推荐1】已知抛物线C:
的焦点F到其准线的距离为2,圆M:
,过F的直线l与抛物线C和圆M从上到下依次交于A,P,Q,B四点,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e383fcc122f267043fbafe0972bfb900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240eb44480acbcdb99313ecae825032d.png)
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【推荐2】已知点
与抛物线
,过抛物线焦点的直线与抛物线交于A,B两点,与y轴交于点P,若
,且直线QA的斜率为1,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
________ .
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