如图,在长方形
中,
,
,动点P,Q分别从点A,C同时出发,点P以
的速度向点B运动,一直到达点B为止,点Q以
的速度向点D运动,设运动时间为
.
的面积为
?
(2)当t为何值时,线段
的长为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e04947c608f4b7f67b18e8decb05f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d291cfc6c4677d20f8674c57322b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e5acdedbab4bba6a4f5defc72c70b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637a52cabf537ab5fbd1839c2cd5d901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d96e428931b19cf639d3e0f26ebe23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6fd31341daf09b676a7de46efc179f.png)
(2)当t为何值时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
23-24八年级下·安徽亳州·期中 查看更多[4]
安徽省亳州市利辛县2023-2024学年八年级下学期期中数学试题安徽省亳州市涡阳县陈大学区2023-2024学年八年级下学期期中数学试题安徽省阜阳市临泉县中学联考2023-2024学年八年级下学期期中数学试题(已下线)第07讲 一元二次方程与实际问题(思维导图+5知识点+10考点+过关检测)【暑假自学课】-2024年新九年级数学暑假提升精品讲义(华东师大版)
更新时间:2024-04-30 11:17:01
|
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解答题-问答题
|
适中
(0.65)
【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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
,点
从点
开始沿
边向点
以
的速度匀速移动,同时另一点
由
点开始以
的速度沿着
匀速移动,几秒时,
的面积等于
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d4c86270f9231ab3790d0576bdfef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是
的直径,点
是
上一点,过点
作
的切线交
延长线于点
,
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/0a095bcd-285c-4612-95b6-ad8c60a9d6ff.png?resizew=110)
(1)求证:
平分
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/0a095bcd-285c-4612-95b6-ad8c60a9d6ff.png?resizew=110)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee5c73b57f6b4241292ebc41e1f4ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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,在矩形
中,
,点E是
边上一动点(点E不与A,D重合),连接
,以
为边在直线
的右侧作矩形
,使得矩形
矩形
交直线
于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/3b6fee07-d796-416d-b1cf-91869324f9e3.png?resizew=156)
【尝试初探】
(1)在点E的运动过程中,
与
始终保持相似关系,请说明理由;
【深入探究】
(2)随着E点位置的变化,H点的位置也随之发生变化,当B,C,G共线时,连接
,求
的数量关系;
【拓展延伸】
(3)连接
,当
的长度为
时,求
的最小值(用含n和
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【尝试初探】
(1)在点E的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4ce3f962c91f0d3c7b998b5fbb37b5.png)
【深入探究】
(2)随着E点位置的变化,H点的位置也随之发生变化,当B,C,G共线时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a04ef4a57e2fc46eec19fda396cdd6.png)
【拓展延伸】
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0cf7c4cde3d35712af6dfc566929f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次