1 . 在边长为4的正方形
中,E是
边上一点,
,点Q是对角线
上的动点.求:
周长的最小值.
![](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/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90d21a684db97952b0d8d2a2e0c3950.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/a7084a4f-5424-49f6-abe2-7dc48de6f960.png?resizew=129)
您最近一年使用:0次
2 . 如图,在长度为1个单位长度的小正方形组成的长方形中,点A,B,C在小正方形的顶点上.
(1)在图中画出与△ABC关于直线l成轴对称的△AB′C′;
(2)计算△ABC的面积;
(3)在直线l上找一点P,使PB+PC的长最短.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/4074a1ca-fc98-4684-ba75-f6f7362b3955.png?resizew=165)
(1)在图中画出与△ABC关于直线l成轴对称的△AB′C′;
(2)计算△ABC的面积;
(3)在直线l上找一点P,使PB+PC的长最短.
您最近一年使用:0次
2019-12-27更新
|
219次组卷
|
4卷引用:黑龙江省齐齐哈尔市五地市2023-2024学年八年级上学期期中数学试题
3 . 如图所示,矩形
中,
,将矩形
沿直线
折叠,使直线
两侧的部分能够完全重合,点
在边
上,且
,在直线
上有一个动点
,连接
,则
周长的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7cb70b09b2d4767009ce4c0a34dc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c324b6a44969f78d597de56740d03c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9506adf67d4563138dfeb21365b1ba22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/1018caed-e46b-4bf3-9567-3176ef3808f2.png?resizew=108)
您最近一年使用:0次
4 .
中,AC=BC=4,
,D是BC边上的中点,E是AB上的一个动点,则EC+ED的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
A.4 | B.![]() | C.4![]() | D.2![]() |
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5 . 如图,
中,
,
,
,
是
的角平分线,点
是
的中点,
是
上一点,则
周长的最小值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786cd645516dde315a4edb05229446fb.png)
![](https://img.xkw.com/dksih/QBM/2021/9/7/2802881738129408/2804641495506944/STEM/49a311cfd55140d2a82ac3931d2c4fb4.png?resizew=166)
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6 . 如图,在直角坐标xOy中,二次函数图象的顶点坐标为C(4,
),且在x轴上截得的线段AB的长为6.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/dde91053-3fa6-48d5-84f8-2eb2901d9f7f.png?resizew=202)
(1)求二次函数的解析式;
(2)在y轴上求作一点P(不写作法)使PA+PC最小,并求P点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47153fdd73c0661fa460130082e30929.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/dde91053-3fa6-48d5-84f8-2eb2901d9f7f.png?resizew=202)
(1)求二次函数的解析式;
(2)在y轴上求作一点P(不写作法)使PA+PC最小,并求P点坐标.
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7 . 如图,在正方形网格上的一个 △ABC.(其中点A,B,C均在网格上).
![](https://img.xkw.com/dksih/QBM/2019/11/7/2328798589591552/2329514491158528/STEM/aa51ad6916254bcdae40b2d3ae716a18.png?resizew=223)
(1)作△ABC关于直线MN的轴对称图形△A´B´C´;
(2)在
上画出点
,使得
最小,并求出最小值.
![](https://img.xkw.com/dksih/QBM/2019/11/7/2328798589591552/2329514491158528/STEM/aa51ad6916254bcdae40b2d3ae716a18.png?resizew=223)
(1)作△ABC关于直线MN的轴对称图形△A´B´C´;
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2339b7b98c47b4a339030dc2dbd5c5c3.png)
您最近一年使用:0次
2019-11-08更新
|
196次组卷
|
3卷引用:黑龙江省齐齐哈尔市部分学校2019-2020学年八年级上学期期中数学试题
8 . 如图,一个底面周长为24cm,高为5cm的圆柱体,一只蚂蚁沿侧表面从点A到点B所经过的最短路线长为_____ .
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417786215743488/2418880854179840/STEM/2e5effa292f54b5c9684f7414cb367d7.png?resizew=92)
您最近一年使用:0次
2020-03-13更新
|
134次组卷
|
2卷引用:黑龙江省哈尔滨六十九中2018-2019学年八年级下学期3月月考数学试题
名校
9 . 小镇A与B在公路同侧,如图,A到公路的距离为45里,要在公路边建一个货站,及货站到A、B的两条乡道,经计算,两条乡道总长最短可为140里,此时两条乡道的夹角为120°,则B到公路的距离为__ 里.
![](https://img.xkw.com/dksih/QBM/2021/8/13/2785157606047744/2794576144416768/STEM/d97c8296-f7c6-41d0-9766-1e9d44e3b7ad.png?resizew=176)
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10 . 没有上盖的圆柱盒高为10cm,周长为32cm,点A距离下底面3cm.一只位于圆柱盒外表面点A处的蚂蚁想爬到盒内表面对侧中点B处.则蚂蚁需要爬行的最短路程的长为_________ cm.
![](https://img.xkw.com/dksih/QBM/2014/9/4/1573748814864384/1573748820385792/STEM/43f7861f8c284dea8a66546e47944733.png?resizew=91)
您最近一年使用:0次
2016-12-05更新
|
1657次组卷
|
3卷引用:黑龙江省齐齐哈尔富拉尔基区2020-2021学年八年级下学期期末考试数学试题