如图,在平面直角坐标系中,
的顶点
是坐标原点,点
的坐标为
,点
的坐标为
,动点
从点
出发以每秒4个单位长度的速度沿
轴向终点
运动,过点
作
轴交直线
于点
,过点
作
轴于点
,设动点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cc6d4f9a-04e6-4d12-afad-027dba829745.png?resizew=363)
(1)填空:
的长为______,
的长为______;
(2)当
时,求点
的坐标;
(3)当点
在
的平分线上时,求动点
的运动时间
的值;
(4)当
平分四边形
的一边时,请直接写出运动时间
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d80c318fcc307874b99148d00d0bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b18fcb4734da15196f17519dc038c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e7c6d54b0d73fa8d3af7f2a4d7f049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4facfc5447ae7f665e8ec050b81313.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cc6d4f9a-04e6-4d12-afad-027dba829745.png?resizew=363)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90030dcf7b8ba8ecd3c7060ccd4e7df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2023-12-14 20:21:13
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】已知,如图,
为坐标原点,在四边形
中,
,
,
,
,点D是
的中点,动点P在线段
上以每秒2个单位长度的速度由点C向B运动.设动点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/a1594a4e-96fe-4660-86ab-e133f9bc80b6.png?resizew=228)
(1)当P运动_______秒,四边形
是平行四边形;
(2)在直线
上是否存在一点Q,使得以O、D、Q、P四点为顶点的四边形是菱形?若存在,求t的值,并求出Q点的坐标;若不存在,请说明理由;
(3)在线段
上有一点M,且
,四边形
的最小周长是_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8913d6a8e5021895e6ee06f9c067270d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86cf51378ccec9eae5723f343ca7ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a646715a2fd82e8a9eb46f7961d8e356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f5369ff9d7ccb13605fc726b2bd039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/a1594a4e-96fe-4660-86ab-e133f9bc80b6.png?resizew=228)
(1)当P运动_______秒,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e762c9d832ae824e378205675292d123.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29da20e2cd48f0a178b4ba71eb2c81f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f25919819f947649f0b39dee27f287.png)
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【推荐2】如图,在平面直角坐标系中,直线
与
轴,
轴分别交于点
,
,经过点
的直线与
轴交于点
的解析式;
(2)点
是线段
上一动点,若直线
把
的面积分成
的两部分,请求点
的坐标;
(3)已知
为
的中点,点
是平面内一点,当
是以
为直角边的等腰直角三角形时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e488bcf5c0eacfb5cb27a70038d4f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/c5db41a1f31d6baee7c69990811edb9f.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/2555b9c555e05fb67fe7d5d862cf6851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9176a5e89fbe9a73dc69070d2ab6983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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名校
【推荐3】在平面直角坐标系
中,若
,
为某个矩形不相邻的两个顶点,且该矩形的边均与某条坐标轴垂直,则称该矩形为点
,
的“相关矩形”.图1为点
,
的“相关矩形”的示意图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/58f08d82-cf8b-47a6-9f4f-49b0e0dd4232.png?resizew=269)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/e3bb814a-108c-4ee1-960a-37e307f0a077.png?resizew=268)
已知点A的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77ba8b3cb02c27e2a207a27a5f77701.png)
(1)如图2,点
的坐标为
.
①若
,则点A,
的“相关矩形”的面积是_____________;
②若点A,
的“相关矩形”的面积是8,则
的值为_____________.
(2)如图3,点
在过点
且平行
轴的直线
上,若点A,
的“相关矩形”是正方形,直接写出点
的坐标;
(3)如图4,等边
的边
在
轴上,顶点
在
轴的正半轴上,点
的坐标为
,点
的坐标为
,若在
的边上存在一点
,使得点
,
的“相关矩形”为正方形,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/aa55cb0c-13e3-4c68-af65-cf2a171f3d53.png?resizew=218)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/58f08d82-cf8b-47a6-9f4f-49b0e0dd4232.png?resizew=269)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/d02c25a0-8407-4130-b59a-0869d1676588.png?resizew=267)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/e3bb814a-108c-4ee1-960a-37e307f0a077.png?resizew=268)
已知点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77ba8b3cb02c27e2a207a27a5f77701.png)
(1)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad443593a7eedd7ef8b7e33c48fe06f.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②若点A,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cee9e51b1dd360d8e141e7fa8f4224d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)如图4,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978921b876755d94bebf28c3425e7f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5167a99495d42344970ee6fb5d8d4d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/294f5ba74cdf695fc9a8a8e52f421328.png)
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困难
(0.15)
【推荐1】小李同学在认真阅读了书本第54页活动2的内容后,按书本的描述,进行了如下探索:
第一步:先在平面直角坐标系中找点
,再在x轴上任意找点
;
第二步:过点M作x轴的垂线交线段
的垂直平分线于点P,连接
,设点P的坐标是
;
(1)如图1,小李同学先用含y的代数式表示了
= ;过点A作
于点G,在
中,用含x和y的式子可求得
= ;由垂直平分线性质可知:
,即
=
,由此可推出点P的纵坐标y与横坐标x满足的函数关系式为: ;
(2)当(1)中所求得的函数自变量x满足
时,函数y有最小值为2,求m的值;
(3)如图2,直线
与(1)中所得抛物线交于点B、C,点D为线段
的中点,点
,点F为抛物线上的一动点,当
最小时,是否存在点F使
,若存在,请直接写出满足条件的所有点F的坐标;若不存在,请说明理由.
第一步:先在平面直角坐标系中找点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32366143230ca122894a4bada7c7b96d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e4dfcf145b2248858d0219ed57186d.png)
第二步:过点M作x轴的垂线交线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/0940ca2e-dffb-4485-bc37-5dffe76e0db3.png?resizew=433)
(1)如图1,小李同学先用含y的代数式表示了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2a8f5d7b41c3450d564761ba3d2087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1d7410352a564e2c715cdbfbf9886f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48963d6f40d9d338ca32589f97236d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5c42347914f246ad01bf2a13022095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9762c971608302e44b8157df68504f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5c42347914f246ad01bf2a13022095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2a8f5d7b41c3450d564761ba3d2087.png)
(2)当(1)中所求得的函数自变量x满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2198978baa5a994212ecd40c2a6ad351.png)
(3)如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb3fc0283e1c8dd515e37e2af5e1834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f320075cb747d3a747bb6dd87c4814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94dd9ba51277c49554e50ed6aa0aa6f6.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,在
中,
,
,
,垂足为
.点
为边
上一点(不与
、
重合),连接
作
,射线
交射线
于
.设
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/03e0ab33-c0d9-4662-a114-dac27f9d00d9.png?resizew=180)
(1)求证:
;
(2)当点
在线段
上时,求
关于
的函数解析式并写出定义域;
(3)当
时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e486a1aad96167ff62f6fb5136e0bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49ce41b39ceeceb71d70b5936e72b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/c2ecc2c5ae1e5e9f8bceed2df5fa0bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a353c44d3794f25611f8360b5bf81c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/03e0ab33-c0d9-4662-a114-dac27f9d00d9.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
(2)当点
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7113af427935078e717cc9b4cfb17a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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【推荐1】如图,在Rt△ABC与Rt△ABD中,∠ACB=∠DAB=90°,AB2=BC·BD,AB=3,过点A作AE⊥BD,垂足为点E,延长AE、CB交于点F,连接DF
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893833194643456/2898537492987904/STEM/d623be9f-3ba5-409b-95b5-a4e1592ad430.png?resizew=181)
(1)求证:AE=AC;
(2)设
,
,求
关于
的函数关系式及其定义域;
(3)当△ABC与△DEF相似时,求边BC的长.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893833194643456/2898537492987904/STEM/d623be9f-3ba5-409b-95b5-a4e1592ad430.png?resizew=181)
(1)求证:AE=AC;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01f16d28648942a80c08efcf99a7e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当△ABC与△DEF相似时,求边BC的长.
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真题
【推荐2】如图甲,在△ABC中,∠ACB=90°,AC=4cm,BC=3cm.如果点P由点B出发沿BA方向向点A匀速运动,同时点Q由点A出发沿AC方向向点C匀速运动,它们的速度均为1cm/s.连接PQ,设运动时间为t(s)(0<t<4),解答下列问题:
(1)设△APQ的面积为S,当t为何值时,S取得最大值,S的最大值是多少;
(2)如图乙,连接PC,将△PQC沿QC翻折,得到四边形PQP′C,当四边形PQP′C为菱形时,求t的值;
(3)当t为何值时,△APQ是等腰三角形.
(1)设△APQ的面积为S,当t为何值时,S取得最大值,S的最大值是多少;
(2)如图乙,连接PC,将△PQC沿QC翻折,得到四边形PQP′C,当四边形PQP′C为菱形时,求t的值;
(3)当t为何值时,△APQ是等腰三角形.
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742694727680/1573742700838912/STEM/46655007fb2d43fda01b8a300a569cc0.png?resizew=277)
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解题方法
【推荐1】已知.矩形
中,
为边
上一点.
为
上一点,
.
(1)如图,
为
中点,
,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007355904/STEM/5dcc6ed5-0246-4d84-8c6b-c5cf260a9883.png?resizew=206)
(2)如图,直线
交
于
,且
,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007355904/STEM/fb86b5c1-294c-4809-a63a-c1e0be0cdf2a.png?resizew=207)
(3)如图,若
,直接写出
的值.
![](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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
(1)如图,
![](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/36b071b198422075c2e4bb403778bcff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676be1538a4c851eafacb08f2a2fee2a.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007355904/STEM/5dcc6ed5-0246-4d84-8c6b-c5cf260a9883.png?resizew=206)
(2)如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d440215e4ca391884e61b1017e329e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f6ccb4459f196a783cfe3d19a3ddc2.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007355904/STEM/fb86b5c1-294c-4809-a63a-c1e0be0cdf2a.png?resizew=207)
(3)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee0dc6e7b77db67dddee36393534bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007355904/STEM/c34e5887-3241-4215-b90f-b148fe330c6f.png?resizew=215)
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困难
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【推荐2】抛物线
(a,b,c是常数,
)的顶点为D,与x轴相交于点
,
是y轴上的一个定点.
(1)若
,且抛物线过定点M,求抛物线解析式和顶点D的坐标;
(2)已知抛物线的顶点D在x轴上方,且点D在直线
上.
①若
,求抛物线解析式和顶点D的坐标;
②若点E是直线
上的动点,点F是x轴上的动点,当
的周长的最小值
时,直接写出抛物线的顶点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6c344a3735c9062fc91f9fa57b70db.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
(2)已知抛物线的顶点D在x轴上方,且点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d86bdca15922c7896ffe4de3a06bc21.png)
②若点E是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5447a70b9197de4d2814c227a33b42fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73268b04f5691702cfb5d0250c01b457.png)
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