如图,
是边长为6cm的等边三角形,动点
,
同时从
,
两点出发,分别沿
,
匀速移动,它们的速度都是2
,当点
到达点
时,
,
两点都停止运动,设点
的运动时间为
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/0ea251ed-58f5-4dba-ac7f-0b5aa9221c6c.png?resizew=165)
(1)当
为何值时,
是以
为直角的直角三角形?
(2)是否存在
,使四边形
的面积是
面积的
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/aa88c1d12df2b7e1bfc0a7c0d7438cf6.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/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/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/0ea251ed-58f5-4dba-ac7f-0b5aa9221c6c.png?resizew=165)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af84f29bce5daf53b8e7ddbe15ca980.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5b62ea69808e36e57db3cf2583f118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
22-23九年级上·广东江门·期中 查看更多[5]
广东省江门市台山市广州大学台山附属中学2022-2023学年九年级上学期期中考试数学试题(已下线)专题22.7 利用一元二次方程解决几何中的三大动点问题-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题21.7 利用一元二次方程解决几何中的三大动点问题-2023-2024学年九年级数学上册举一反三系列(人教版)(已下线)专题1.7 利用一元二次方程解决几何中的三大动点问题-2023-2024学年九年级数学上册举一反三系列(苏科版)(已下线)专题2.7 利用一元二次方程解决几何中的三大动点问题-2023-2024学年九年级数学上册举一反三系列(北师大版)
更新时间:2022-12-14 17:43:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在矩形ABCD中,
,
,
,点P从点E出发,沿EB方向匀速运动,速度为1cm/s;同时,点Q从点C出发,沿CD方向匀速运动,速度为2cm/s,连接PQ,设运动时间为t(s)(
),解答下列问题:
![](https://img.xkw.com/dksih/QBM/2019/9/20/2294883950116864/2294980226899968/STEM/d0d783e16b9143d88c523bf85ee1d293.png?resizew=135)
(1)当t为何值时,
?
(2)设四边形PBCQ的面积为y(cm2),求y与t的函数关系式;
(3)是否存在某一时刻t,使四边形PBCQ的面积是四边形PQDE的面积的4倍?若存在,求出t的值;若不存在,说明理由.
(4)连接BD,点O是BD的中点,是否存在某一时刻t,使P,O,Q在同一直线上?若存在,求出t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730fa1c944486291ef3ea6da6a72edee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5c1d7a1dfc7a16f55bfadac6d4da28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1af4cc3e596147c04cf0ad214069679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb4337e61fdb8a9e216273edab4579c.png)
![](https://img.xkw.com/dksih/QBM/2019/9/20/2294883950116864/2294980226899968/STEM/d0d783e16b9143d88c523bf85ee1d293.png?resizew=135)
(1)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa884503e7d2137a11f67d74bb79f0c.png)
(2)设四边形PBCQ的面积为y(cm2),求y与t的函数关系式;
(3)是否存在某一时刻t,使四边形PBCQ的面积是四边形PQDE的面积的4倍?若存在,求出t的值;若不存在,说明理由.
(4)连接BD,点O是BD的中点,是否存在某一时刻t,使P,O,Q在同一直线上?若存在,求出t的值;若不存在,说明理由.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】在长方形ABCD中,
,
,点P从点A开始沿边
向终点B以
的速度移动,与此同时,点Q从点B开始沿边
向终点C以
的速度移动.如果P、Q分别从A、B同时出发,当点Q运动到点C时,两点停止运动.设运动时间为t秒.
(1)填空:
________
,
_________
(用含t的代数式表示);
(2)当t为何值时,
的长度等于
?
(3)是否存在t的值,使得
的面积等于
?若存在,请求出此时t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/96b44c11-ecd3-47b0-ac57-cb207e263389.png?resizew=106)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf757b473eb160e42173982184ac5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
(3)是否存在t的值,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38309217f0970107f6f6e65a4c77bae6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在等边
中,点
,
分别在边
、
上,
,过点
作
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/274f1f74-f30e-4ea7-888f-31d01d793d60.png?resizew=120)
(1)求
的度数.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/274f1f74-f30e-4ea7-888f-31d01d793d60.png?resizew=120)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,点D是等边△ABC中BC边上一点,过点D分别作DE∥AB,DF∥AC,交AC,AB于E,F,连接BE,CF,分别交DF,DE于点N,M,连接MN.试判断△DMN的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2015/9/22/1573913405931520/1573913412263936/STEM/5e6d70d7633440069407de785307fea0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】(1)如图1,已知正方形ABCD、等腰直角△AEF,∠AEF=90°,连接CE,H为CE中点,连接BH、BF.
①
=_________;②∠HBF=_________.
(2)试证明以上①②两结论;
(3)如图2,已知平行四边形ABCD和△AEF,H为CE中点,
=
=k,
(0°<
<90°),直接写出:
①
=_________;(用k的代数式表示)
②
=_________.(用k、θ的代数式表示)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7616d3d0c17bc6e45ea3b5df0646abde.png)
(2)试证明以上①②两结论;
(3)如图2,已知平行四边形ABCD和△AEF,H为CE中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9ca97c8cd8eac7f583630a9b0f38fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfd6f73d6aa265a5f84750cf2a1b8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45863cc3e1ef48fc171a7a5d79544719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280c783fd14d005e858a45b9f6f97456.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb40555f353e6acf8cf2c2af5b6f7ac.png)
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939588012843008/2963867212906496/STEM/378ed4c2-3a53-4598-bac7-9e0adcbb419c.png?resizew=502)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,一条笔直的公路l经过某水厂A和宝塔B,我区某镇准备开发桑葚基地C,经测量C位于A北偏东60°,B的北偏东30°上,且AB=20km.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/a34eed50-9bf2-475d-b4e9-1f18ead32203.png?resizew=267)
(1)求宝塔B到桑葚基地C的距离.
(2)为了方便游客到桑葚基地C采摘桑葚,镇里决定由C向公路l修建一条距离最短的公路,不考虑其他因数,求出这条最短公路的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/a34eed50-9bf2-475d-b4e9-1f18ead32203.png?resizew=267)
(1)求宝塔B到桑葚基地C的距离.
(2)为了方便游客到桑葚基地C采摘桑葚,镇里决定由C向公路l修建一条距离最短的公路,不考虑其他因数,求出这条最短公路的长.
您最近一年使用:0次