如图,动点P在边长为2的等边△ABC的边上.它从点A出发,沿A→C→B→A的方向以每秒1个单位长度的速度运动.如果点P的运动时间为t秒,点P与点C之间的距离记为y,那么y与t之间的函数关系用图像表示大致是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/81b28e15-4d86-455d-8c8d-fed48cc5851a.png?resizew=149)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/81b28e15-4d86-455d-8c8d-fed48cc5851a.png?resizew=149)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2022-07-06 23:00:16
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【推荐1】如图①,在矩形
中,H为
边上的一点,点M从点A出发沿折线
运动到点B停止,点N从点A出发沿
运动到点B停止,它们的运动速度都是
,若点M、N同时开始运动,设运动时间为
,
的面积为
,已知S与t之间函数图象如图②所示,则下列结论不正确的是( )
为等腰三角形的点M一共有4个.
②当
时,
.
③当
时,
.
④当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd78f3a70c75b311e746819aee4b6489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f372e567a416d3dc405b2b0d72506b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255aeb7e872740911e79ac5f79eed05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d87192c7368b3f1d454ee9c7980f01e.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d415a551223d2a942cc67f8ce68d267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c64398e20399cdd283eee9fc35f4d9.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e099f51ad74647388ba416157128c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e9572d315dc2ebd198eca5da3c2ffa.png)
A.① | B.② | C.③ | D.④ |
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【推荐2】如图1,在平行四边形
中,点O为对角线
的中点,连接
,动点P从点B出发,沿折线
以每秒1个单位长度的速度匀速运动,连接
.设点P的运动时间为x(单位:s),
的长度为y,图2为y随x的变化而变化的函数图象,则四边形
的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/5/6/2714983078305792/2716593609080832/STEM/0efeadc6465e40f989e264b79aacdac8.png?resizew=445)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8ecfe4c739f604aab571402b59dd8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2714983078305792/2716593609080832/STEM/0efeadc6465e40f989e264b79aacdac8.png?resizew=445)
A.15 | B.24 | C.28 | D.30 |
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【推荐1】如图,在边长为4的等边△ABC中,点P从A点出发,沿A→B→C→A的方向运动,到达A点时停止.在此过程中,线段AP的长度y随点P经过的路程x的函数图象大致是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b8256900-8881-4bfa-bfa4-312dd9fc639b.png?resizew=110)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b8256900-8881-4bfa-bfa4-312dd9fc639b.png?resizew=110)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】如图,△ABC是边长为1的等边三角形,分别取AC、BC边的中点D、E,连接DE,作EF∥AC,得到四边形EDAF,它的周长记作C1;分别取EF、BE的中点D1、E1,连接D1E1,作E1F1∥EF,得到四边形E1D1FF1,它的周长记作C2,照此规律作下去,则C2021等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/677bc97d-ff09-4d9b-901c-dafa4426485e.png?resizew=126)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/677bc97d-ff09-4d9b-901c-dafa4426485e.png?resizew=126)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在△ABC中,AB=AC=5,BC=8,⊙O经过B,C两点,且AO=4,则⊙O的半径长是( )
![](https://img.xkw.com/dksih/QBM/2012/6/27/1573420274868224/1573420317515776/STEM/f68ea572-61df-4308-82cf-0d8ac296578b.png?resizew=169)
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A.![]() ![]() | B.4或![]() | C.4或![]() | D.4或![]() ![]() |
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【推荐2】如图,在平行四边形
中,用直尺和圆规作
的平分线
交
于点E,若
,
,则
的长为( )
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A.6 | B.8 | C.9 | D.10 |
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