如图,在平面直角坐标系中,抛物线
与x轴正半轴交于点A.直线
与x轴交于点B,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/120b11e5-5545-44f9-9c2f-85af69b33e61.png?resizew=297)
(1)求线段
的长度;
(2)将抛物线W平移,使平移后的抛物线交y轴于点D,与直线
的一个交点为P,若以A、B、D、P为顶点的四边形是以
为边的平行四边形,求平移后的抛物线表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0285f2e4c569b22412e72bb17602416f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24edd2a1d145627d07330524017daf5c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/120b11e5-5545-44f9-9c2f-85af69b33e61.png?resizew=297)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)将抛物线W平移,使平移后的抛物线交y轴于点D,与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2022-06-07 14:51:24
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【推荐1】如图,直线AB:
与直线CD:
交于点E,点P在线段BE上.
![](https://img.xkw.com/dksih/QBM/2022/4/17/2965982625226752/2987140467589120/STEM/1911f86d-3c4d-42c1-9c4b-9f52ea1a8c9d.png?resizew=193)
(1)当
面积为3时,在y轴上有两动点M,N(点M在点N的上方),且
,在直线CE上有一动点Q,当
最小时,求出点Q的坐标;
(2)在(1)的条件下,x轴上是否存在一点K,使
为等腰三角形?若存在,直接写出点K的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2965982625226752/2987140467589120/STEM/1911f86d-3c4d-42c1-9c4b-9f52ea1a8c9d.png?resizew=193)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c096bd244d7e30e8ef26fb5278aac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e8b37720fcf8222abc3d06775d12d6.png)
(2)在(1)的条件下,x轴上是否存在一点K,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345f52e0835cc13f92b6801169105a17.png)
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解题方法
【推荐2】如图,正比例函数y=
x与一次函数y=ax+7的图像相交于点P(4,n),过点A(t,0)作x轴的垂线l,且0<t<4,交一次函数的图像于点B,交正比例函数的图像于点C,连接OB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/971dc06d-d49c-4e01-99a8-8e11bded6db4.png?resizew=160)
(1)求a值;
(2)设△OBP的面积为s,求s与t之间的函数关系式;
(3)当t=2时,在正比例函数y=
x与一次函数y=ax+7的图像上分别有一动点M、N,是否存在点M、N,使△CMN是等腰直角三角形,且∠CNM=90º,若存在,请直接写出点M、N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/971dc06d-d49c-4e01-99a8-8e11bded6db4.png?resizew=160)
(1)求a值;
(2)设△OBP的面积为s,求s与t之间的函数关系式;
(3)当t=2时,在正比例函数y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
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【推荐1】如图,抛物线
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/775d5127-d8f9-48c7-a89a-526e956cb17d.png?resizew=186)
(1)求该抛物线的解析式;
(2)若点
是线段
上一动点,过点
的直线
平行于
轴并交抛物线于点
,当线段
取得最大值时,在
轴上是否存在这样的点
,使得以点
、
、
为顶点的三角形是以
为腰的等腰三角形?若存在,请求出所有点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327c07d35ab0d9fb751b904e5cd038f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3af02baf8698283da1642be10139742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/775d5127-d8f9-48c7-a89a-526e956cb17d.png?resizew=186)
(1)求该抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】在平面直角坐标系
中,
为坐标原点,已知抛物线
与
轴交于点
,抛物线的对称轴与
轴交于点
.
(1)如图,若
,抛物线的对称轴为
.求抛物线的解析式,并直接写出
时
的取值范围;
(2)在(1)的条件下,若
为
轴上的点,
为
轴上方抛物线上的点,当
为等边三角形时,求点
,
的坐标;
(3)若抛物线
经过点
,
,
,且
,求正整数m,n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/de963733-a6e9-411f-9274-0d89669b28db.png?resizew=397)
(1)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a84757fa1fc2e9bf6134c12dce7fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236eb567f8d64885db1db31ab2d123aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f409b28f7cb97726646e79709ad25190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732c018e69d42df32aaac87095890b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9045f99b8590fb72176eb30ff1d4e8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7919606fa820131bf60526ac17bd26a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
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【推荐1】如图,二次函数
的图象经过
三点,顶点为D,已知点B的坐标是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/01c65bee-84a2-4440-9189-613ed0ecd3f7.png?resizew=193)
(1)求这个二次函数的表达式;
(2)若E是线段
上的一个动点(E与
不重合),过点E作平行于y轴的直线交抛物线于点F,求线段
长度的最大值;
(3)将(1)中的函数图象平移后,表达式变为
,若这个函数在
时的最大值为3,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54809c0a261ec3329e1eca519a3fcad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/01c65bee-84a2-4440-9189-613ed0ecd3f7.png?resizew=193)
(1)求这个二次函数的表达式;
(2)若E是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)将(1)中的函数图象平移后,表达式变为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de40f4288e66692b970f786e601a4387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d544d676ba61b4315817833fdf5c01eb.png)
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【推荐2】如图1,已知抛物线
与y轴交于点A(0,﹣4),与x轴相交于B(﹣2,0)、C(4,0)两点,O为坐标原点.
(1)求抛物线的解析式;
(2)设点E在x轴上,∠OEA+∠OAB=∠ACB,求BE的长;
(3)如图2,将抛物线y=ax2+bx+c向右平移n(n>0)个单位得到的新抛物线与x轴交于M、N(M在N左侧),P为x轴下方的新抛物线上任意一点,连PM、PN,过P作PQ⊥MN于Q,
是否为定值?请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960746064068608/1961899717517312/STEM/42de3dd7cd374df6abfaaf2e1fdcadcb.png?resizew=201)
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960746064068608/1961899717517312/STEM/b9fa907ebd6e495da95e8e90f7d609e5.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(1)求抛物线的解析式;
(2)设点E在x轴上,∠OEA+∠OAB=∠ACB,求BE的长;
(3)如图2,将抛物线y=ax2+bx+c向右平移n(n>0)个单位得到的新抛物线与x轴交于M、N(M在N左侧),P为x轴下方的新抛物线上任意一点,连PM、PN,过P作PQ⊥MN于Q,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1be8514c74230c729415f59776a807a.png)
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960746064068608/1961899717517312/STEM/42de3dd7cd374df6abfaaf2e1fdcadcb.png?resizew=201)
![](https://img.xkw.com/dksih/QBM/2018/6/5/1960746064068608/1961899717517312/STEM/b9fa907ebd6e495da95e8e90f7d609e5.png?resizew=226)
图1 图2
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【推荐1】如图,在平面直角坐标系中,抛物线
与x轴交于点
、
,与y轴交于点C.点P在线段
上(不与点A、C重合),
轴交抛物线于点Q,以
为边作矩形
,矩形的顶点M、N均在此抛物线的对称轴上.设点P的横坐标为m.
(2)当
时,y的取值范围是______;
(3)设矩形
的周长为l,求l与m之间的函数关系式;
(4)当矩形
被线段
分成的两部分图形的面积比为
时,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd726a709fcbca1ddf826dca89d054f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f27083267432a9352fb6677a07d461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
(3)设矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(4)当矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc411e9b272ddfb7301ae96618225fc5.png)
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【推荐2】已知二次函数图象的顶点坐标为M(1,0),直线
与该二次函数的图象交于A,B两点,其中A点的坐标为(3,-4),B点在y轴上.
(1)求m的值及这个二次函数的解析式;
(2)在x轴上找一点Q,使△QAB的周长最小,并求出此时Q点坐标;
(3)若P(t,0)是x轴上的一个动点,过P作x轴的垂线分别与直线AB和二次函数的图象交于D、E两点.
①设线段DE的长为h,当0<t<3时,求h与t之间的函数关系式;
②若直线AB与抛物线的对称轴交点为N,问是否存在一点P,使以M、N、D、E为顶点的四边形是平行四边形?若存在,请求出此时P点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b74381f68eb1e33d412a7a3d62313f.png)
(1)求m的值及这个二次函数的解析式;
(2)在x轴上找一点Q,使△QAB的周长最小,并求出此时Q点坐标;
(3)若P(t,0)是x轴上的一个动点,过P作x轴的垂线分别与直线AB和二次函数的图象交于D、E两点.
①设线段DE的长为h,当0<t<3时,求h与t之间的函数关系式;
②若直线AB与抛物线的对称轴交点为N,问是否存在一点P,使以M、N、D、E为顶点的四边形是平行四边形?若存在,请求出此时P点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/5/10/1942431964938240/1943890243256320/STEM/28fd13067fe6419aaebf79895eba943f.png?resizew=193)
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【推荐3】如图1,在平面直角坐标系中,抛物线
与x轴交于点A和点B(点A在点B左侧),与y轴交于点C.
(1)求直线BC的解析式;
(2)点P是直线BC上方抛物线上的一动点,过点P作y轴的平行线交BC于点D,过点P作x轴的平行线交BC于点E,求
的最大值及此时点P的坐标;
(3)如图2,在(2)中
取得最大值的条件下,将抛物线
沿着射线CB方向平移得到新抛物线
,且新抛物线
经过线段BC的中点F,新抛物线
与y轴交于点M,点N为新抛物线
对称轴上一点,点Q为坐标平面内一点,若以点P,Q,M,N为顶点的四边形是以PN为边的菱形,写出所有符合条件的点Q的坐标,并写出求解点Q的坐标的其中一种情况的过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6bec369c91304c86a2c13a5698b56a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/89840410-aec2-475a-b498-2582bae216e6.png?resizew=280)
(1)求直线BC的解析式;
(2)点P是直线BC上方抛物线上的一动点,过点P作y轴的平行线交BC于点D,过点P作x轴的平行线交BC于点E,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c0a77bbb685fe184f758a40d00bbc8.png)
(3)如图2,在(2)中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c0a77bbb685fe184f758a40d00bbc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6bec369c91304c86a2c13a5698b56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
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