如图,在矩形
中,
,
,点P从点A出发,以每秒
个单位长度的速度沿
方向运动,点Q从点C出发,以每秒2个单位长度的速度沿对角线
方向运动.已知P,Q两点同时出发,当点Q到达点A时,P,Q两点同时停止运动,连接
.设运动时间为t秒.
(1)
______,
______.
(2)当t为何值时,
的面积为
.
(3)是否存在某一时刻t,使
是以
为底边的等腰三角形?如果存在,求出t值,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddad21a6de8f54e65123d274c0098c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/222d641b-7d69-48e2-91d0-fb43491e6a0c.png?resizew=175)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)是否存在某一时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
更新时间:2023-09-07 10:05:35
|
相似题推荐
解答题-问答题
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适中
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【推荐1】已知:如图,在
中,
,
,
.点
从点
开始沿
边向点
以
的速度移动,同时点
从点
开始沿
边向点
以
的速度移动.当一个点到达终点时另一点也随之停止运动,设运动时间为
秒,
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075613971054592/2076582058614784/STEM/8aa498ee19bf4673862cb258eb39f092.png?resizew=89)
求几秒后,
的面积等于
?
求几秒后,
的长度等于
?
运动过程中,
的面积能否等于
?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5687fd83c7f1059caa39b02a131cca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eda91b63c488fbade4157f65e1cc53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2924155c77d7a0266ac4aceecfd9c139.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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f601546a19f1b6ae7ba6fbc5c08706d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc114541c729cd8d1132e46c4884413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075613971054592/2076582058614784/STEM/8aa498ee19bf4673862cb258eb39f092.png?resizew=89)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535fd0b786ddec1bd82e6e510143097c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2005aa4cafebed388e5b79a4962567e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4865f9eac02a32e5c6c1ae0ccbcc3a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d8ea93db7e78bd7235fc85e3c4c55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6df4d071305296ad754eb1f7cb220bd.png)
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名校
【推荐2】如图,
中,
,
,
,点
从
点出发以每秒
的速度向
点运动,同时
从
点出发以相同的速度向
点运动,当其中一个点到达目的地时,另一点自动停止运动,设运动时间为
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/a6ff1430-9a14-47ab-9a10-3387764ca557.png?resizew=126)
(1)用含
的代数式表示
、
的长,并直接写出
的取值范围;
(2)多长时间后
的面积为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58196842483577dbc6be9bc873651d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.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/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/a6ff1430-9a14-47ab-9a10-3387764ca557.png?resizew=126)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)多长时间后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e59990ecc935b45d43d678802d3affb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e9cb3cf2c44395ac26cd003f144828.png)
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【推荐3】如图,在△ABC中,∠B=90°,AB=12cm,BC=24cm,动点P从点A开始沿边AB向点B以2cm/s的速度移动,动点Q从点B开始沿边BC向点C以4cm/s的速度移动,如果P、Q两点分别从A,B两点
同时出发,设运动时间为
s.
(1)用含
的式子表示:
AP= cm,BP= cm,BQ= cm,
cm2,
cm2;
(2)当△PBQ的面积为32cm2时,求运动时间;
(3)四边形APQC的面积能否等于72cm2?若能,求出运动的时间;若不能,说明理由.
同时出发,设运动时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
AP= cm,BP= cm,BQ= cm,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1be17c8031f90af8ce219f544e1550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2f431a120d8b26cb10cea15277b520.png)
(2)当△PBQ的面积为32cm2时,求运动时间;
(3)四边形APQC的面积能否等于72cm2?若能,求出运动的时间;若不能,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/8db4a406-9769-4b42-b366-ac0ba632c350.png?resizew=251)
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【推荐1】如图1所示,等边△ABC中,AD是BC边上的中线,根据等腰三角形的“三线合一”特性,AD平分∠BAC,且AD⊥BC,则有∠BAD=30°,BD=CD=
AB.于是可得出结论“直角三角形中,30°角所对的直角边等于斜边的一半”.
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573951965159424/1573951971557376/STEM/e8f8b743270b4ca09d026d86d78786ce.png?resizew=554)
请根据从上面材料中所得到的信息解答下列问题:
(1)△ABC中,若∠A:∠B:∠C=1:2:3,AB=
,则BC= ;
(2)如图2所示,在△ABC中,∠ACB=90°,BC的垂直平分线交AB于点D,垂足为E,当BD=5cm,∠B=30°时,△ACD的周长= .
(3)如图3所示,在△ABC中,AB=AC,∠A=120°,D是BC的中点,DE⊥AB,垂足为E,那么BE:EA= .
(4)如图4所示,在等边△ABC中,D、E分别是BC、AC上的点,且∠CAD=∠ABE,AD、BE交于点P,作BQ⊥AD于Q,猜想PB与PQ的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573951965159424/1573951971557376/STEM/e8f8b743270b4ca09d026d86d78786ce.png?resizew=554)
请根据从上面材料中所得到的信息解答下列问题:
(1)△ABC中,若∠A:∠B:∠C=1:2:3,AB=
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573951965159424/1573951971557376/STEM/e495564ab8ad4d059ba60844b519a4b0.png?resizew=13)
(2)如图2所示,在△ABC中,∠ACB=90°,BC的垂直平分线交AB于点D,垂足为E,当BD=5cm,∠B=30°时,△ACD的周长= .
(3)如图3所示,在△ABC中,AB=AC,∠A=120°,D是BC的中点,DE⊥AB,垂足为E,那么BE:EA= .
(4)如图4所示,在等边△ABC中,D、E分别是BC、AC上的点,且∠CAD=∠ABE,AD、BE交于点P,作BQ⊥AD于Q,猜想PB与PQ的数量关系,并说明理由.
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【推荐2】如图1,这是一款升降电脑桌,图2是它的示意图.已知EF∥MN,点A,B在MN上滑动,点D,C在EF上滑动,AC,BD相交于点O,OA=OB=OC=OD=30cm.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980891172519936/2986325301903360/STEM/efe38d4b-604c-4a5b-b847-be9d3d41d6b4.png?resizew=114)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980891172519936/2986325301903360/STEM/8f666ba7-a774-45c3-9006-01488b1dcb9e.png?resizew=154)
(1)如图2,当∠OAB=30°时,求这款电脑桌当前的高度.
(2)当电脑桌从图2位置升到图3时,此时∠OAB=45°,求点A从图2滑至图3时移动的距离.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980891172519936/2986325301903360/STEM/efe38d4b-604c-4a5b-b847-be9d3d41d6b4.png?resizew=114)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980891172519936/2986325301903360/STEM/8f666ba7-a774-45c3-9006-01488b1dcb9e.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980891172519936/2986325301903360/STEM/b4518a0f-bd1b-49d0-a750-ec964f33ed93.png?resizew=151)
(1)如图2,当∠OAB=30°时,求这款电脑桌当前的高度.
(2)当电脑桌从图2位置升到图3时,此时∠OAB=45°,求点A从图2滑至图3时移动的距离.
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解答题-作图题
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适中
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【推荐1】如图,在矩形
中,点
在边
上,
,
(1)请用直尺(不带刻度)和圆规,按下列要求作图:在
的延长线上求作点
,使
,连接
.(要求:保留作图痕迹,不写作法)
(2)在(1)的条件下:
①求证:
平分
;
②求线段
的长.
![](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/3eccae2c5a87582426336f58cd4c59ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/85d2fabd-175f-4d8e-9016-43444404ccb1.png?resizew=149)
(1)请用直尺(不带刻度)和圆规,按下列要求作图:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a09981c03e8e6c00b7a65c56d95050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb8807c9f6d564ca4d09ea60638fd38.png)
(2)在(1)的条件下:
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
②求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】在矩形
中,
为边
上一点,且
,点
是线段
上一动点,直线
与直线
相交于点
,射线
与直线
相交于点
,且
.已知
.
的代数式表示线段
的长,
______;
(2)①当点
与点
重合时,求线段
的长;
②若点
在线段
上,求
的范围;
(3)求
的面积(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97beb988073189e81aa717c362427e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.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/f7c57b07f75e97d9f84718bd495ebcf4.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/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f01298478e42c97ab9b3aa07e77d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c30f73c718bde8352055a14987fc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
(2)①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4031d50318f8faa4b1eefd1dec796420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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名校
【推荐1】阅读下列一段文字,然后回答下列问题.已知在平面内两点
,
,其两点间的距离
.同时,当两点所在的直线在坐标轴或平行于坐标轴或垂直于坐标轴时,两点间距离公式可简化为
或
.
(1)已知
,
,试求A、B两点间的距离;
(2)已知一个三角形各顶点坐标为
、
、
,请判定此三角形的形状,并说明理由.
(3)已知
,在x轴上是否存在一点P,使
为等腰三角形,若存在请直接写出点P的坐标;若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b8ae26c446d54f456a4f9b2f28d091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4e94463a0f22990789c5494916e844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea85462de4f0c3de7b8f47242a3102b.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c21dde2ad1e31c337bfb78c810ccb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07bddd9bebc06909947a3f429ce3348.png)
(2)已知一个三角形各顶点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c80eabaf101288433b3b9e92a4805a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cba284d675a3028d7a8d54f1f8ae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f63f0bdeade1904c747ec9ef0ff3443.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图所示,在每个小正方形的边长均为1的网格中,线段AB的端点A、B均在小正方形的顶点上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/795c8902-3acd-443e-aaa5-416eb61f6ab5.png?resizew=184)
(1)在图中画出等腰△ABC,且△ABC为钝角三角形,点C在小正方形顶点上;
(2)在(1)的条件下确定点C后,再画出矩形BCDE,D,E都在小正方形顶点上,且矩形BCDE的周长为16,直接写出EA的长为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/795c8902-3acd-443e-aaa5-416eb61f6ab5.png?resizew=184)
(1)在图中画出等腰△ABC,且△ABC为钝角三角形,点C在小正方形顶点上;
(2)在(1)的条件下确定点C后,再画出矩形BCDE,D,E都在小正方形顶点上,且矩形BCDE的周长为16,直接写出EA的长为 .
您最近一年使用:0次