如图,在菱形ABCD中,点E在BC边上(与点B、C不重合),连接AE交BD于点G.
(1)若AG=BG,AB=2,BD=3,求线段DG的长;
(2)设BC=kBE,△BGE的面积为S,△AGD和四边形CDGE的面积分别为S1和S2,把S1和S2分别用k、S的代数式表示;
(3)求
的最大值.
(1)若AG=BG,AB=2,BD=3,求线段DG的长;
(2)设BC=kBE,△BGE的面积为S,△AGD和四边形CDGE的面积分别为S1和S2,把S1和S2分别用k、S的代数式表示;
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad5a9147b25285124851a61c7d1a24a.png)
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883422135181312/2886436156923904/STEM/bc57d51324724c0892bc793e453127ef.png?resizew=347)
21-22九年级上·浙江杭州·阶段练习 查看更多[4]
浙江省杭州市萧山区高桥初级中学2021-2022学年九年级上学期12月月考数学试题浙江省杭州市萧山区高桥初中教育集团2021-2022学年九年级12月学情调研数学试题 江苏省泰州市靖江市2021-2022学年九年级上学期期末数学试题(已下线)第22课 相似三角形的性质及其应用-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(浙教版)
更新时间:2022-01-03 12:12:18
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【推荐1】如图1,抛物线
与
轴交于
两点,与
轴交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2023/12/19/3392435207479296/3459049092538368/STEM/90f2b12efd8944b3b1c19dfddfd12018.png?resizew=309)
![](https://img.xkw.com/dksih/QBM/2023/12/19/3392435207479296/3459049092538368/STEM/aa2bcb266a9e4379b346a50ad65171eb.png?resizew=243)
(1)求抛物线的解析式.
(2)如图1,点
是第一象限抛物线上一点,连接
,交线段
于点
,求
的最大值及此时点
的坐标.
(3)如图2,点
为
轴负半轴上的一点,且
,若点
是线段
上点,连接
,将
沿直线
翻折得到
,当直线
与直线
相交所成锐角为
时,求点
的坐标.
![](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/39698959ba7b4d735e0121144427cfb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5558ffa6dc28d437c0467c7f361d444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2023/12/19/3392435207479296/3459049092538368/STEM/90f2b12efd8944b3b1c19dfddfd12018.png?resizew=309)
![](https://img.xkw.com/dksih/QBM/2023/12/19/3392435207479296/3459049092538368/STEM/aa2bcb266a9e4379b346a50ad65171eb.png?resizew=243)
(1)求抛物线的解析式.
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2244f3227a392f4b576d2464b890cab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051aa57be541a4ee032c502fc1003763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a10347f66197ccc693068ca3686e793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed4d3de99291a1cd77636de11fea9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e346ac3950f60077291dda2be73c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
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【推荐2】如图,抛物线
与x轴交A、B两点(A点在B点左侧),直线
与抛物线交于A、C两点,其中C点的横坐标为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/775042de-dc5d-43d0-bac8-4edfa163bd98.png?resizew=159)
(1)求A、B 两点的坐标及直线
的函数表达式;
(2)P是线段
上的一个动点,过P点作y轴的平行线交抛物线于点E,求线段
长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92738aadeac1e3d3d8e919772bce727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/775042de-dc5d-43d0-bac8-4edfa163bd98.png?resizew=159)
(1)求A、B 两点的坐标及直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(2)P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
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【推荐3】将一个平行四边形纸片ABCD放置在平面直角坐标系中,O为原点,点
,点
,点D在y轴正半轴上,
.
![](https://img.xkw.com/dksih/QBM/2021/5/26/2729293469466624/2729358023598080/STEM/3eed823e-fb44-4c70-93d4-c25820f9b444.png)
(I)如图①,求点D的坐标;
(II)剪切下
并将其沿x轴正方向平移,点A的对应点为
,点D的对应点为
,点O的对应点为
,设
,
和四边形OBCD重叠部分的面积为S.
①如图②,若平移后
和四边形OBCD重叠部分是五边形时,
交y轴于点E,
交BC于点F,试用含有t的式子表示S,并直接写出t的取值范围;
②当
时,求S的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd99c5000629d7f49499d666e68f40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/2021/5/26/2729293469466624/2729358023598080/STEM/3eed823e-fb44-4c70-93d4-c25820f9b444.png)
(I)如图①,求点D的坐标;
(II)剪切下
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace07d078895165cf28b921e3c037247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ec5b34559d44ba345133399644b485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70983f2a9a87a79573dca1ea94d6aa4.png)
①如图②,若平移后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70983f2a9a87a79573dca1ea94d6aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb2f87d7a79bd800f2650a670a46761.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6a246a2d287d62c98dec132a71a5f0.png)
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【推荐1】已知抛物线
经过点
,与
轴交于点
.
(1)求抛物线
的表达式;
(2)平移抛物线
,设平移后的抛物线为
,抛物线
的顶点记为
,它的对称轴与
轴交于点
,已知点
,怎样平移才能使得以
、
、
、
顶点的四边形为菱形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0d7bca4431a338446d8d3a6e5e3be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b289e821e552e8489ddda0517dedf1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5abc4464f8c0424a6c896617321757.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
(2)平移抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e0bb98cb93b43f8de0c06c4b73e913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,已知抛物线
与x轴交于
和
两点,与y轴交于点C.
(2)若直线
与抛物线交于点D,与直线
交于点F,交x轴交于点E.当
取得最大值时,求m的值和
的最大值;
(3)若抛物线
的顶点为P,Q是该抛物线对称轴上一点,在平面内确定一点R,使得以点C,R,P,Q为顶点的四边形是菱形,求点R的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8e072bf31deb363dafc0a87af9f513.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096b20e054d8fb85e6617fa1ab55d57a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
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【推荐3】问题发现:
是半径为2的
上一点,直线
是圆
外一条直线,
于点
,圆心
到直线
的距离为3,则线段
的最小值为______;
问题探究:
(2)如图2,在
中,
,
,
,点
是
边上一动点且满足
,点
是
的中点,当点
在
运动时,求
面积的最小值.
问题解决:
(3)如图3,有一边长为20米的菱形参观展览区
,点
为
的中点,点
是
上一点,
,根据实际情况,需要在
右侧建造一个与
对称的茶歇区
,点
的对应点为
,连接
交
于
,连接
,展方为了增加展区的总体收益,欲在茶歇区斜对面位置内出售高品质茶具,决定在
上选取一点
,使
,划定
为茶具售卖区,已知茶具售卖区每平方米
元,问该售卖区最少需要多少元?(
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c50360563e2a58800af3a9cf7d9652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
问题探究:
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54cfc1c15c0361cf5b81c03640faede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
问题解决:
(3)如图3,有一边长为20米的菱形参观展览区
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865c9e604abc386f4a61c1dc1ba24466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5090091503f9c176630ba736fd42e67c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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解答题-证明题
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【推荐1】我们定义:如果圆的两条弦互相垂直,那么这两条弦互为“十字弦”,也把其中的一条弦叫做另一条弦的“十字弦”.如:如图,已知
的两条弦
,则
、
互为“十字弦”,
是
的“十字弦”,
也是
的“十字弦”.
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304307712/STEM/9a311375-c8f3-467d-9be3-cb5ac18e8b47.png)
(1)若
的半径为5,一条弦
,则弦
的“十字弦”
的最大值为______,最小值为______.
(2)如图1,若
的弦
恰好是
的直径,弦
与
相交于
,连接
,若
,
,
,求证:
、
互为“十字弦”;
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304307712/STEM/cf5590ec-d354-4816-8739-d319632d6f8f.png)
(3)如图2,若
的半径为5,一条弦
,弦
是
的“十字弦”,连接
,若
,求弦
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304307712/STEM/9a311375-c8f3-467d-9be3-cb5ac18e8b47.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f708ba8b731e6718cb733d5ae3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fee1c453ff0673cabd091bef7d39e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304307712/STEM/cf5590ec-d354-4816-8739-d319632d6f8f.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304307712/STEM/69e4a511-b757-4e3a-825b-f59217f8bed0.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,二次函数y
bx+c的图象与x轴交于A(3,0),B(﹣1,0),与y轴交于点C.若点P,Q同时从A点出发,都以每秒1个单位长度的速度分别沿AB,AC边运动,其中一点到达端点时,另一点也随之停止运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/4fa3ba62-2f1e-4951-82e2-6ca2fa5e56fc.png?resizew=193)
(1)直接写出二次函数的解析式;
(2)当P,Q运动到t秒时,将△APQ沿PQ翻折,若点A恰好落在抛物线上D点处,求出D点坐标;
(3)当点P运动到B点时,点Q停止运动,这时,在x轴上是否存在点E,使得以A,E,Q为顶点的三角形为等腰三角形?若存在,请直接写出E点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc79f7d8c2c0409c0bb8a4d83f0fdf5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/4fa3ba62-2f1e-4951-82e2-6ca2fa5e56fc.png?resizew=193)
(1)直接写出二次函数的解析式;
(2)当P,Q运动到t秒时,将△APQ沿PQ翻折,若点A恰好落在抛物线上D点处,求出D点坐标;
(3)当点P运动到B点时,点Q停止运动,这时,在x轴上是否存在点E,使得以A,E,Q为顶点的三角形为等腰三角形?若存在,请直接写出E点坐标;若不存在,请说明理由.
您最近一年使用:0次