名校
解题方法
1 . 已知抛物线
及
轴上一点
,过点
的直线l与抛物线
交于
两点.
(1)若直线
的倾斜角为
,且|
,求点
的横坐标的取值范围;
(2)设
,若对给定的点
的值与直线
位置无关,此时的点
称为拋物线
的“平衡点”,问抛物线
的“平衡点”是否存在?若存在,求出所在“平衡点”坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b199d124fb9a5bc8438c9884f04534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d9e33f039dd4edfafe636cb8cab384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1787979eabc2d89ab007e37581b9d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f241b253d7608fdfd92d5fa21f7290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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2 . 如图,已知抛物线
的焦点为F,过点F的直线交C于A,B两点,以AB为直径的圆交x轴于M,N,且当
轴时,
.
(1)求抛物线C的方程;
(2)若直线AN,AM分别交抛物线C于G,H(不同于A),直线AB交GH于点P,且直线AB的斜率大于0,证明:存在唯一这样的直线AB使得B,H,P,M四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323232ab36943d1d5d2831d70ffcff87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ceb92b88602f8623ee9b034e1f4fee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/3a00c39c-b197-4107-a3e2-fffa8324d7fb.png?resizew=153)
(1)求抛物线C的方程;
(2)若直线AN,AM分别交抛物线C于G,H(不同于A),直线AB交GH于点P,且直线AB的斜率大于0,证明:存在唯一这样的直线AB使得B,H,P,M四点共圆.
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3 . 如图已知抛物线
,过点
作两条直线分别交抛物线于
和
(其中
位于
轴上方),直线
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445448565784576/2445563761287168/STEM/ab1bca55-8c89-460b-96e5-cff70f0ee875.png)
(1)求证:点
在定直线上;
(2)当
分别为
的中点时,求出直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b072ff6d1b83232bebd7d4709ffba4ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f449cadb49859b80c31ef1f68bfe81b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445448565784576/2445563761287168/STEM/ab1bca55-8c89-460b-96e5-cff70f0ee875.png)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77af6561921afe6bf7bd8eb5d2ddec61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
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解题方法
4 . 如图,已知抛物线
:
上一点
,过点
作直线
交抛物线
于另一点
,点
在线段
上,
在抛物线
上,
轴,
于点
.
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407376326369280/2407948169666560/STEM/764b5d0a-802d-4430-abe0-39d1163fbfc8.png)
(1)若
,求
的最大值;
(2)求使等式
恒成立的直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42102c1c07562853219ca5918803a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a47f347332121e35902946727c8e1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a9ef65be4d2c76c63034474267ee6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cd0205624365e44b8dd394f6b2a1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407376326369280/2407948169666560/STEM/764b5d0a-802d-4430-abe0-39d1163fbfc8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66ad18de58798ad92c04a7b91817b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a203d0478f8390fa2b346500ccb2b63.png)
(2)求使等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee8ec9fed478627f55b917c9acaff28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
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5 . 已知A,B是抛物线
上的两点,且在x轴两侧,若AB的中点为Q,分别过A,B两点作T的切线,且两切线相交于点P.
(1)求证:直线PQ平行于x轴;
(2)若直线AB经过抛物线T的焦点,求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb2c5e3b4d493fcf1bbe773ee4b5135.png)
(1)求证:直线PQ平行于x轴;
(2)若直线AB经过抛物线T的焦点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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6 . 已知抛物线L:
(
)的焦点为F,过点
的动直线l与抛物线L交于A,B两点,直线
交抛物线L于另一点C,直线
的最小值为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/6d7bfe95-67a5-47a9-9373-26cb8af2ad99.png?resizew=211)
(1)求抛物线L的方程;
(2)若过点A作y轴的垂线m,则x轴上是否存在一点
,使得直线PB与直线m的交点恒在一条定直线上?若存在,求该点的坐标及该定直线的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35cd5d4e230d2d5ac2d1a534f23dc33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/6d7bfe95-67a5-47a9-9373-26cb8af2ad99.png?resizew=211)
(1)求抛物线L的方程;
(2)若过点A作y轴的垂线m,则x轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c9b882323edba16b3625458239b6f3.png)
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7 . 如图,已知抛物线
上一点
,过点Q作直线QT交抛物线C于另一点T,M是抛物线C上异于Q,T两点的动点,A,B在直线QT上,
,
轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/bf82d420-65e4-477b-abed-1a1941a39b8a.png?resizew=186)
(1)若
,
,求
的最大值;
(2)求使
恒成立的直线QT的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a47f347332121e35902946727c8e1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cd0205624365e44b8dd394f6b2a1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022075455e53b63258a3f70fd4f794b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/bf82d420-65e4-477b-abed-1a1941a39b8a.png?resizew=186)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66ad18de58798ad92c04a7b91817b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733b8b10baf8f452b8c05e989afcc561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a203d0478f8390fa2b346500ccb2b63.png)
(2)求使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee8ec9fed478627f55b917c9acaff28.png)
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名校
8 . 如图,过点
作两条直线
和l分别交抛物线
于A,B和C,D(其中A,C位于x轴上方,l的斜率大于0),直线AC,BD交于点Q.
![](https://img.xkw.com/dksih/QBM/2019/9/18/2293450797875200/2293570172461056/STEM/34b3a465-58d3-4bfa-93be-d8643b0c5689.png)
(1)求证:点Q在定直线上;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f449cadb49859b80c31ef1f68bfe81b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://img.xkw.com/dksih/QBM/2019/9/18/2293450797875200/2293570172461056/STEM/34b3a465-58d3-4bfa-93be-d8643b0c5689.png)
(1)求证:点Q在定直线上;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036dbe969c79edae3c812676021b9965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2019-09-18更新
|
581次组卷
|
3卷引用:浙江省名校协作体2019-2020学年高三第一学期第一次联考数学试题
9 . 已知动圆过定点
,且与直线
相切.
(1)求动圆的圆心
的轨迹
的方程;
(2)若曲线
上一点
,是否存在直线
与抛物线
相交于两不同的点
,使
的垂心为
.若存在,求直线
的方程;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32df158dd2d590af5646657afb0101.png)
(1)求动圆的圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6f5217e765043d31de5ab5d9f130d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5df138fd6f908dad62bcbfcb910962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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