已知:如图①,菱形
中,对角线
相交于点O,且
,
.点P从点A出发,沿
方向匀速运动,速度为
;同时,直线
从点D出发,沿
方向匀速运动,速度为
,
,且与
分别交于点E,Q,F;当直线EF停止运动时,点P也停止运动.连接
,设运动时间为
.解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/090f4956-a79d-4647-8c4e-b4826bf68193.png?resizew=394)
(1)当t为何值时,点A在线段
的垂直平分线上?
(2)设四边形
的面积为
,求y与t之间的函数关系式;
(3)如图②,连接
,是否存在某一时刻t,使
?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e78e09d194bf11cc12858fd22d58b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e857e447e4896ff57978a78a96ad28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654bdcd4d474a9899693db1eec0d71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654bdcd4d474a9899693db1eec0d71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1a80f3d9daaba119b22cdc0183967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c04dec8abf4b928b885eb8388bf67f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dde29486c27bf2905ced2fc8308e80a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/090f4956-a79d-4647-8c4e-b4826bf68193.png?resizew=394)
(1)当t为何值时,点A在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bffa9f4d710fc07a5d18734337ff35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacd892f03da01942140679667792250.png)
(3)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb86e5da3cbc672f1102cb9023a217c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690c71fc8b006dd50add271426fc189c.png)
更新时间:2023-04-15 18:21:07
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,
.动点
从点
出发,沿
以每秒4个单位长度的速度向终点
运动,当点
不与点
、
重合时,过点
作
交折线
于点
,取
的中点
,设点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/2022/4/4/2950912616382464/2967078232825856/STEM/361b810d-9e9c-4268-9eba-29d9e239be64.png?resizew=219)
(1)线段
______.
(2)直接写出线段
的长,(用含
的代数式表示)
(3)当直线
将
分成的两部分能拼成一个新的三角形(不重叠)时,求
的值.
(4)取
的中点
,作直线
,当直线
垂直于
一边时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/5963abe8f421bd99a2aaa94831a951e9.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/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a52ef2a5f53a6d6aed3617b64b3d58b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/4/2950912616382464/2967078232825856/STEM/361b810d-9e9c-4268-9eba-29d9e239be64.png?resizew=219)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】(1)问题背景:如图①,已知△ABC∽△ADE,求证:△ABD∽△ACE;
(2)拓展应用:如图②,在△ABC和△ADE中,
,
,点D在BC边上,AC与DE相交于点F,且
,求
的值.
(2)拓展应用:如图②,在△ABC和△ADE中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cab3976641d2ad9aa50a30d4c8092cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97418d2fb37fdaa2c7d3ebe154b99c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ec395fe7a4bc51dac28c37085fabcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/ea211a0f-2627-4da2-82ba-4b9f4538705c.png?resizew=442)
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【推荐1】【基础巩固】
(1)如图1,在
中,D为
上一点,
.求证:
.
【尝试应用】
(2)如图2,在平行四边形
中,E为
上一点,F为
延长线上一点,
.若
,
,求
的长.
【拓展提高】
(3)如图3,在菱形
中,E是
上一点,F是
内一点,
,
,
,
,
,则菱形
的边长为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/df2e50aa-5134-4c3b-9d05-3a87f37acf8d.png?resizew=451)
(1)如图1,在
![](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/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025a9324effb6fc7af086fbaf59af8d5.png)
【尝试应用】
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779c4ce536e09195a94dc4006de14028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64e0206b1814c35cc96bd2b6b12239a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【拓展提高】
(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3471bde9ec2c95cc301b4b3f468ca4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199d2e656abd4a338a26336418266289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图1,在△ABC中,∠B=90°,∠C=30°,点D从C点出发沿着CA方向以2个单位每秒的速度向终点A运动,同时点E从点A出发沿AB方向以1个单位每秒的速度向终点B运动.设点D,E的运动时间为t秒,DF⊥BC于F.
(1)求证:AE=DF;
(2)如图2,连接EF,AC=12.
①是否存在t,使得四边形AEFD为菱形?若存在,求出t的值;若不存在,请说明理由;
②连接DE,当△DEF是直角三角形时,求t的值.
(1)求证:AE=DF;
(2)如图2,连接EF,AC=12.
①是否存在t,使得四边形AEFD为菱形?若存在,求出t的值;若不存在,请说明理由;
②连接DE,当△DEF是直角三角形时,求t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/39eb563c-1c76-4366-b4e4-076b5d9378d8.png?resizew=473)
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解答题-问答题
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较难
(0.4)
解题方法
【推荐3】如图,抛物线
交于
轴于
两点(点
在点
的左侧),且
两点的横坐标分别是
和2,交
轴于点
,且
的面积为24.
(1)求抛物线的解析式.
(2)如图1,若
,过点
作
交
轴于点
,点
是抛物线上
下方的一动点,连接
,求
面积的最大值以及最大值时点
的坐标.
(3)如图2,将原抛物线向右平移4个单位长度,得到新的抛物线
,平移后的抛物线与原抛物线的交点为
.在(2)的条件下,在直线
上是否存在一点
,在平面直角坐标系中是否存在一点
,使得以
为顶点的四边形是菱形?若存在,直接写出点
的坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求抛物线的解析式.
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20b4743ae3afbd9192b22732881a91d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1912c4e0fe478ba402a887fdc759d3f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/bed391ab757e54f382655d314a90eb92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,将原抛物线向右平移4个单位长度,得到新的抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047c96a12dfa8588b920c7e109c05efd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/044cf201f9a978616e66883c97a76cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/94743d20-717b-4e76-91ee-199e36e29180.png?resizew=400)
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解答题-问答题
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较难
(0.4)
【推荐1】已知直角三角形ABC中,
,
,
,动点P从点A出发,以每秒3个单位的速度沿折线
向终点C运动,且不与
的顶点重合,点D为边AB的中点,当点P不与点D重合时,过点P作线段PD的垂线与
的一边交于点Q,构造
,设点P的运动时间为t(
).
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957445422440448/2962335471034368/STEM/799cb71e-4c56-4484-acde-fc927b03bd99.png?resizew=146)
(1)线段BC的长为________.
(2)点P在线段AB上运动时,用t表示线段PD的长.
(3)点P在线段AB上运动,当
是以DQ为腰的等腰三角形时,求t的值.
(4)当点P经过点D后,作点Q关于PD的对称点为
,当
时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81934fab0e09e2305a8a889e43bab7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1703ac7db44d1032aabc54b33413454d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957445422440448/2962335471034368/STEM/799cb71e-4c56-4484-acde-fc927b03bd99.png?resizew=146)
(1)线段BC的长为________.
(2)点P在线段AB上运动时,用t表示线段PD的长.
(3)点P在线段AB上运动,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41984f53bb280ba8b5ac00a52ce2825.png)
(4)当点P经过点D后,作点Q关于PD的对称点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49373e0de00f0df98ee6833ec5a7a83.png)
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【推荐2】如图,点
是一次函数
与反比例函数
(
)的图象的一个交点,点
是一次函数与
轴的交点.
(1)求反比例函数表达式;
(2)点
是
轴正半轴上的一个动点,设
,过点
作垂直于x轴的直线,分别交一次函数,反比例函数的图象于点A,B,过OP的中点Q作x轴的垂线,交反比例函数的图象于点C,交一次函数的图象于点
.
①当
时,求
ABC的面积;
②当a为何值时,
ACF与
EQF相似.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2368edb3252d7a257d5c5f6187024d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求反比例函数表达式;
(2)点
![](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/28b9ce1e53f6485bb31d6ff358c676fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
②当a为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2883141841592320/2886037530484736/STEM/8b1181e9-22c2-4d1f-828c-90a8adfe2f1c.png?resizew=314)
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解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图,
经过
的顶点A,C,并与
边相交于点D,过点D作DF∥BC,与
相交于点E,与
相交于点F,连接DC,有
.
(1)求证:
为
的切线;
(2)若
,求
的值;
(3)连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99695884c1f123b5c8ef14d256d2ce8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27ad52bb727deb009ab5f5c6e8fa2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03005d17bf564371ad29fea41f5c650.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e09989ecf4d7b01111c35a8b5e282f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730631244455936/2730689687764992/STEM/2638834b7c834e4bb80337e467354c68.png?resizew=212)
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解答题-问答题
|
较难
(0.4)
【推荐2】在平面直角坐标系xOy中,给出如下定义:若点P在图形M上,点Q在图形N上,称线段PQ长度的最小值为图形M,N的密距,记为d(M,N).特别地,若图形M,N有公共点,规定d(M,N)=0
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/b6d02366-391d-4107-9db2-6dccd461c610.png?resizew=276)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/7c4c2d7e-cd8b-41fa-b73c-8caf803f4802.png?resizew=259)
(1)如图1,⊙O的半径为2,
①点A(0,1),B(4,3),则d(A,⊙O)=___________,d(B,⊙O)=___________.
②已知直线L:y=
与⊙O的密距d(L,⊙O)=
,求b的值.
(2)如图2,C为x轴正半轴上一点,⊙C的半径为1,直线y=﹣
与x轴交于点D,与y轴交于点E,直线DE与⊙C的密距d(DE,⊙C)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089fac47b5ecbfd1c2a72ecebc40f204.png)
.请探求写出圆心C的横坐标m的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/b6d02366-391d-4107-9db2-6dccd461c610.png?resizew=276)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/7c4c2d7e-cd8b-41fa-b73c-8caf803f4802.png?resizew=259)
(1)如图1,⊙O的半径为2,
①点A(0,1),B(4,3),则d(A,⊙O)=___________,d(B,⊙O)=___________.
②已知直线L:y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3adfc790464cd770b593d1969a257ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc4b4a44c90267f67228329e6a1d822.png)
(2)如图2,C为x轴正半轴上一点,⊙C的半径为1,直线y=﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9c3d9084eb14e8c1c91563a83f5991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089fac47b5ecbfd1c2a72ecebc40f204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
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