如图,抛物线
与
轴交于点
,点
,与
轴交于点
,抛物线的对称轴为直线
,点
坐标为
.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804600347361280/2810863176286208/STEM/7fc73bac-6de2-4254-b52a-ecc4d5702cd9.png?resizew=507)
(1)求抛物线表达式;
(2)在抛物线上是否存在点
,使
,如果存在,求出点
坐标;如果不存在,请说明理由;
(3)点
是线段
上的动点,点
是线段
上的动点,点
是线段
上的动点,三个动点都不与点
,
,
重合,连接
,
,
,得到
,直接写出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804600347361280/2810863176286208/STEM/7fc73bac-6de2-4254-b52a-ecc4d5702cd9.png?resizew=507)
(1)求抛物线表达式;
(2)在抛物线上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e11fcd0bfedc0f007912d3fcc847883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e66b12019cdf68327d34c90dff7c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c018b37259f3ead2ab2d94bd744f44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c720d05edfe4388f42306a3e47cb4e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c720d05edfe4388f42306a3e47cb4e0.png)
更新时间:2021-09-18 17:38:40
|
相似题推荐
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【推荐1】如图,已知抛物线y=ax2+bx+c(a≠0)的对称轴为直线x=﹣1,求抛物线经过A(1,0),C(0,3)两点,与x轴交于A、B两点.
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527582614716416/2530959489351680/STEM/fdb43d856d8a4db5a2f4593b58eca105.png?resizew=182)
(1)若直线y=mx+n经过B、C两点,求直线BC和抛物线的解析式;
(2)在该抛物线的对称轴x=﹣1上找一点M,使点M到点A的距离与到点C的距离之和最小,求出点M的坐标;
(3)设点P为该抛物线的对称轴x=﹣1上的一个动点,直接写出使△BPC为直角三角形的点P的坐标.
(提示:若平面直角坐标系内有两点P(x1,y1)、Q(x2,y2),则线段PQ的长度PQ=
).
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527582614716416/2530959489351680/STEM/fdb43d856d8a4db5a2f4593b58eca105.png?resizew=182)
(1)若直线y=mx+n经过B、C两点,求直线BC和抛物线的解析式;
(2)在该抛物线的对称轴x=﹣1上找一点M,使点M到点A的距离与到点C的距离之和最小,求出点M的坐标;
(3)设点P为该抛物线的对称轴x=﹣1上的一个动点,直接写出使△BPC为直角三角形的点P的坐标.
(提示:若平面直角坐标系内有两点P(x1,y1)、Q(x2,y2),则线段PQ的长度PQ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e8221447d40cf554d2a87bac6caece.png)
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【推荐2】如图,在菱形
中,
,
,点
从点
出发,沿线段
以每秒1个单位长度的速度向终点
运动,过点
作
于点
,作
交直线
于点
,交直线
于点
,设
与菱形
重叠部分图形的面积为
(平方单位),点
的运动时间为
(秒).
(1)当点M与点B重合时,求t的值;
(2)当t为何值时,
与
全等;
(3)求S与t的函数关系式;
(4)以线段
为边,在
右侧作等边三角形
,求整个运动过程
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60dbd2fa523a47d7ce766715e4168dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/d079a2e7-6dcf-4386-b939-1710450d7219.png?resizew=181)
(1)当点M与点B重合时,求t的值;
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d493b4c84d8dc832e323a0bcd0db5589.png)
(3)求S与t的函数关系式;
(4)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4f9ce6fc0562eed85581a88f417be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】综合与实践
折纸是一项有趣的活动,同学们小时候都玩过折纸,可能折过小动物、小花、飞机、小船等,折纸活动也伴随着我们初中数学的学习.
在折纸过程中,我们可以通过研究图形的性质和运动、确定图形位置等,进一步发展空间观念,在经历借助图形思考问题的过程中,我们会初步建立几何直观.折纸往往从矩形纸片开始,现在就让我们带着数学的眼光,看看折叠矩形的对角线之后能得到哪些数学结论.
【实践操作】
如图,在矩形纸片
的对角线
上有一动点
(点
不与点
,点
重合),小颖将矩形纸片
折叠,使点
与对角线
上的动点
重合,然后展开,折痕交
于点
,交
于点
,连接
,
.
(1)如图1,点
在对角线
的不同位置时,小颖发现
,
会出现特殊性,比如它们可以是直角三角形,等腰三角形等,而且很多线段之间存在着一些数量关系.若矩形纸片
的边长
,
.
①当
为直角时,求线段
的长;
②当
为等腰三角形时,求线段
的长;
(2)如图2,连接
,作
交
于点
,求证:
.
折纸是一项有趣的活动,同学们小时候都玩过折纸,可能折过小动物、小花、飞机、小船等,折纸活动也伴随着我们初中数学的学习.
在折纸过程中,我们可以通过研究图形的性质和运动、确定图形位置等,进一步发展空间观念,在经历借助图形思考问题的过程中,我们会初步建立几何直观.折纸往往从矩形纸片开始,现在就让我们带着数学的眼光,看看折叠矩形的对角线之后能得到哪些数学结论.
【实践操作】
如图,在矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb82d496588a371ebd342428a5b402d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5d0162d0ee5286bf0f1996d7180382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007dce2ba694c15a6a6492530ff62afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5d0162d0ee5286bf0f1996d7180382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8252bf10029b5d651236a46a6ed46a69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1bef79681763fe0c2d901c55bd2e9b.png)
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真题
【推荐2】如图,已知抛物线
(
)与x轴相交干点A、B.与y轴相交于点C,且点A在点B的左侧.
![](https://img.xkw.com/dksih/QBM/2015/8/5/1573892074373120/1573892080918528/STEM/ebb992d2-234e-43a3-ab87-d9ac08c5282a.png?resizew=252)
(1)若抛物经过点C(2,2),求实数m的值;
(2)在(1)的条件下,解答下列问题:
①求出△ABC的面积;
②在抛物线的对称轴上找一点H,使AH+CH最小,并求出点H的坐标;
(3)在第四象限内,抛物线上是否存在点M,使得以点A、B、M为顶点的三角形与△ACB相似?若存在,求m的值;若不存在.请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fbb090c5f5a3580dd3bf7662ac6c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://img.xkw.com/dksih/QBM/2015/8/5/1573892074373120/1573892080918528/STEM/ebb992d2-234e-43a3-ab87-d9ac08c5282a.png?resizew=252)
(1)若抛物经过点C(2,2),求实数m的值;
(2)在(1)的条件下,解答下列问题:
①求出△ABC的面积;
②在抛物线的对称轴上找一点H,使AH+CH最小,并求出点H的坐标;
(3)在第四象限内,抛物线上是否存在点M,使得以点A、B、M为顶点的三角形与△ACB相似?若存在,求m的值;若不存在.请说明理由.
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真题
【推荐1】如图,在
中,点D、E、F分别在
、
、
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/76d13d47-5c24-403e-be46-8c9a86f45e53.png?resizew=483)
(1)如图1,当
时,图1中是否存在与
相等的线段?若存在,请找出并加以证明.若不存在说明理由.
(2)如图2,当
(其中
)时,若
,
,求
的长(用含k,m的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c7169497a2002aa17d57eb5326a0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df07a13ca9f6b88310b1bcffe455bd1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/76d13d47-5c24-403e-be46-8c9a86f45e53.png?resizew=483)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481f12e0c9062e17ec4f6457577b1484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffbb4e6b92463a41bd9460dac6b1ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d40fa059a2b28c1ef4b36411999931a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】折纸中的数学:打开本指书刊幅面的规格大小.如图①,将一张矩形印刷用纸对折后可以得到2开纸,再对折得到4开纸,以此类推可以得到8开纸、16开纸……
若这张矩形印刷用纸的短边长为a.
(1)如图②,若将这张矩形印刷用纸ABCD(AB>BC)进行折叠,使得BC与AB重合,点C落在点F处,得到折痕BE;展开后,再次折叠该纸,使点A落在E处,此时折痕恰好经过点B,得到折痕BG,求
的值.
(2)如图③,②中的矩形纸片ABCD折成2开纸BCIH和4开纸AMNH,它们的对角线分别是HC、HM.说明HC⊥HM.
(3)将图①中的2开纸、4开纸、8开纸和16开纸按如图④所示的方式摆放,依次连接点A、B、M、I,则四边形ABMI的面积是 .(用含a的代数式表示)
若这张矩形印刷用纸的短边长为a.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/bafbd11a-adba-4d46-b902-07930bb162cf.png?resizew=507)
(1)如图②,若将这张矩形印刷用纸ABCD(AB>BC)进行折叠,使得BC与AB重合,点C落在点F处,得到折痕BE;展开后,再次折叠该纸,使点A落在E处,此时折痕恰好经过点B,得到折痕BG,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
(2)如图③,②中的矩形纸片ABCD折成2开纸BCIH和4开纸AMNH,它们的对角线分别是HC、HM.说明HC⊥HM.
(3)将图①中的2开纸、4开纸、8开纸和16开纸按如图④所示的方式摆放,依次连接点A、B、M、I,则四边形ABMI的面积是 .(用含a的代数式表示)
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