如图,等边三角形ABC中,
,动点D从点B出发,以每秒2个单位的速度沿折线B→A→C的路径向点C运动,同时动点E也从点B出发,沿线段BC以每秒1个单位的速度向点C运动,连接DE,设点D,E的运动时间为x,△BDE的面积为y,则能反映y与x之间函数关系的图象是( )
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011786436608/2984176760758272/STEM/b64f4136-5704-491a-8e19-05cbc9e153c3.png?resizew=124)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011786436608/2984176760758272/STEM/b64f4136-5704-491a-8e19-05cbc9e153c3.png?resizew=124)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2022-05-21 14:26:04
|
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图1,在
中,点D为
的中点,动点P从点D出发,沿着
的路径以每秒1个单位长度的速度运动到点B,在此过程中线段
的长度y随着运动时间x的函数关系如图2所示,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1a8e24a544a4f30e51c6893081a412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图1,
中,点P从点A出发,沿
匀速运动,过点
作
,垂足为
,设点
到点
的距离为
,
的面积为
,则
关于
的函数图象如图2所示,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4309cc517da10cf325b0003e50d8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.2 | B.4 | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】若抛物线
(a、b、c为常数,且
)经过不同的五个点∶![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1ad2ae6090705ceb02b9335dde817a.png)
,则
的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad8ca05b1314d832cf216e897d3ab7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1ad2ae6090705ceb02b9335dde817a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1912669bf3e6567d8021dc17cd6d9987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecbbe6557a18e4886e97f43daae44d0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图,抛物线y=ax2+bx+c(a≠0)与x轴的一个交点的坐标是(-2,0),顶点坐标是(1,3),则下列说法中不正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/1/29/2129332339326976/2131546176135168/STEM/af808bc6c0ed448ea5316a44b3dee9bf.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2019/1/29/2129332339326976/2131546176135168/STEM/af808bc6c0ed448ea5316a44b3dee9bf.png?resizew=117)
A.抛物线的对称轴是直线x=1 | B.抛物线的开口向下 |
C.抛物线与x轴的另一个交点的坐标是(2,0) | D.当x=1时,y有最大值是3 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】如图,在平面直角坐标系中,边长为
的正三角形
的中心与原点O重合,
轴,交y轴于点P.将
绕点O顺时针旋转,每次旋转
,则第
次旋转结束时,点A的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/ebea6ae8-e2fa-4d21-9908-d5b6b66b2649.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图,点
是
的直径
上一动点,
,
是过
点且垂直于
的弦,
是
的中点.当点
从
的中点运动到
的中点时,点
所经过的路径长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次