如图,
是边长为
的等边三角形,动点
以每秒
个单位长度的速度从
出发,沿折线
运动;同时动点
以每秒
个单位长度的速度从
出发,沿折线
方向运动、当两点重合时停止运动,设运动的时间为
秒,记
的长度为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/9b36c6cd-2360-4451-9743-d5d5dd78ed35.png?resizew=379)
(1)请直接写出
关于
的函数关系式并注明自变量
的取值范围;
(2)在给定的平面直角坐标系中,画出这个函数图象,并写出该函数的一条性质;
(3)结合函数图象,直接写出
时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7cd08caa03d0b13b0b99292884d9d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba5ca8ae34ecf31ebdea3c091d356b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21d14b632a1aaa29ac232715a3d28e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/9b36c6cd-2360-4451-9743-d5d5dd78ed35.png?resizew=379)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)在给定的平面直角坐标系中,画出这个函数图象,并写出该函数的一条性质;
(3)结合函数图象,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e537bf8ed8b09b7c6a3aea5ac9ed6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2024-03-24 16:03:13
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在长方形
中,
厘米,
厘米,点
在边
上且
,动点
从A点出发,先以每秒1厘米的速度沿
运动,然后以每秒2厘米的速度沿
运动,再以每秒1厘米的速度沿
运动,最终到达点
.设点
运动的时间是
秒,那么当
为多少时,三角形
的面积等于6平方厘米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8124d4bc63e6b9d3a3fc3a9a900ad95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d6c461ce13423bf8ff268bc5837b9c.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://staticzujuan.xkw.com/quesimg/Upload/formula/9e46bff1ba235329ed6ae1321e33f3b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec7e56107b5f2f34e420caffd1159b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/397d2e46-a368-4703-8998-331bd53e32fb.png?resizew=146)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图1,平行四边形
的一边DC向右匀速平行移动,图2反映它的底边BC的长度l(cm)随时间t(s)变化而变化的情况.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/21ad58d5-5970-4fbf-a81e-7847596b0509.png?resizew=456)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/2ce0e285-6d52-48af-8f48-ee4480114dae.png?resizew=481)
问:
(1)DC边没有运动时,底边BC长度是多少? DC边向右运动了多长时间?
(2)观察图3,在图2的基础上推测DC边在5s后的运动情况是怎样的?
(3)图4反映了变化过程中平行四边形ABCD的面积
随时间t(s)变化的情况
①平行四边形ABCD中,BC边上的高为______cm;
②当
时,面积S的值为______
,当
时,面积S的值为______
.
③在变化过程中,请直接写出平行四边形ABCD面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/21ad58d5-5970-4fbf-a81e-7847596b0509.png?resizew=456)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/2ce0e285-6d52-48af-8f48-ee4480114dae.png?resizew=481)
问:
(1)DC边没有运动时,底边BC长度是多少? DC边向右运动了多长时间?
(2)观察图3,在图2的基础上推测DC边在5s后的运动情况是怎样的?
(3)图4反映了变化过程中平行四边形ABCD的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9091bc1886a3fd3d17160b2d41ded.png)
①平行四边形ABCD中,BC边上的高为______cm;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59797180057c7f5920bfdff8f53b2427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f97843bf6af05b6b31d497634c821a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
③在变化过程中,请直接写出平行四边形ABCD面积的最大值.
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解答题-问答题
|
适中
(0.65)
【推荐1】甲、乙两组工人同时加工某种零件,甲组在工作中有一段时间停产更新设备,更新设备后,甲组的工作效率是原来的2倍.乙组工作2小时后,由于部分工人离开,工作效率有所降低.两组各自加工零件的数量y(件)与时间x(小时)之间的函数图象如图所示.
![](https://img.xkw.com/dksih/QBM/2021/8/8/2781559751057408/2781945641451520/STEM/74c07357d3b04c888d5be15272da1b97.png?resizew=275)
(1)直接写出线段DE的函数关系式,并写出自变量的取值范围;
(2)求甲乙两组何时加工的零件数相同;
(3)若甲、乙两组加工的零件合在一起装箱,每320件装成一箱,零件装箱的时间忽略不计,直接写出经过多长时间恰好装满2箱.
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(1)直接写出线段DE的函数关系式,并写出自变量的取值范围;
(2)求甲乙两组何时加工的零件数相同;
(3)若甲、乙两组加工的零件合在一起装箱,每320件装成一箱,零件装箱的时间忽略不计,直接写出经过多长时间恰好装满2箱.
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系中,正方形ABCD的顶点A的坐标为
(﹣4,8),对角线AC⊥x轴于点C,点D在y轴上,求直线AB的解析式.
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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,在等边三角形
中,点
为
内一点,连接
,
,
,将线段
绕点
顺时针旋转60°得到
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/49f3c02f-c723-447e-a319-758e893f5510.png?resizew=156)
(1)请找出图中与
相等的线段,并证明其相等;
(2)当
时,
①直接写出
的度数为______;
②若
为
的中点,连接
,请用等式表示
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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(1)请找出图中与
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(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b47e792146e2f7d93a9ef9ad1294ed.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e380bce11a8592e17fce18a0634b4482.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,
是等边
的外角
内部的一条射线,点A关于
的对称点为D,连接
,其中
,
分别交射线
于点E,P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/e0e74fad-d7c4-477c-9d5e-f4f1912ffa41.png?resizew=175)
(1)依题意补全图形;
(2)若
,求
的大小(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e520cef3cebf757a24737ffb661834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d3055b122bf4953a3d6cc92ab03d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/e0e74fad-d7c4-477c-9d5e-f4f1912ffa41.png?resizew=175)
(1)依题意补全图形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a09e1bb4a453fd462fd93cefbd2d9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次