如图①,在矩形
中,AB=30cm,BC=60cm.点
从点
出发,沿
路线向点
匀速运动,到达点
后停止;点
从点
出发,沿
路线向点
匀速运动,到达点
后停止.若点
同时出发,在运动过程中,
点停留了
,图②是
两点在折线
上相距的路程S(cm)与时间
(s)之间的部分函数关系图象.求:
(1)P、Q两点的运动速度及P到C点的时间;
(2)设
的面积为
,求
与
之间的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/4853b4705dee3de86e18a346ee3ae853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe7f4205ab9b831ec58a63c125062a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc3872720aaea53d7700872fa244362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49f65332004951d1a9ff8dcadbe89c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(1)P、Q两点的运动速度及P到C点的时间;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb6d13c40cf7205d870d86339b3fe67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0e3edc86f777c300ae57599b27e492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2453883135746048/2456090161717248/STEM/80acdd029caf4071b2343eefec22fe3d.png?resizew=314)
19-20七年级·重庆·课后作业 查看更多[2]
更新时间:2020-05-05 11:51:08
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相似题推荐
解答题-问答题
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(0.4)
名校
【推荐1】如图1,在长方形ABCD中,
,
,点P从点A出发,沿A→B→C→D路线运动,到点D停止;点Q从点D出发,沿D→C→B→A运动,到点A停止.若点P,Q同时出发,点P的速度为1cm/s,点Q的速度为2cm/s,运动a秒后,点P,Q同时改变速度,点P的速度变为6cm/s,点Q的速度变为bcm/s.图2是点P出发x秒后,△APD的面积
(
)与x(s)的函数关系图像;图3是点Q出发x秒后△AQD的面积
(
)与x(s)的函数关系图像.
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971188111728640/2972232429641728/STEM/aef41ab9-6720-4efe-8a94-c6960dc9914c.png?resizew=600)
(1)动点P在线段___上运动时,
的面积保持不变;动点Q到达点A时,x的值为___;
(2)求a,b的值;
(3)设点P离开点A所走的路程为
(cm),点Q离开点D所走的路程为
(cm),当
时,分别求出
,
与x的函数关系式;
(4)当两个动点所走过的路程比为
时,直接写出x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/3/2971188111728640/2972232429641728/STEM/aef41ab9-6720-4efe-8a94-c6960dc9914c.png?resizew=600)
(1)动点P在线段___上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
(2)求a,b的值;
(3)设点P离开点A所走的路程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86474b8b559afef08fa4ea228f84b77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(4)当两个动点所走过的路程比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
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解答题-作图题
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【推荐2】如图,矩形ABCD的对角线上有动点E,连结DE,边BC上有一定点F,连接EF,已知AB=3cm,AD=4cm,设A,E两点间的距离为xcm,D,E两点间的距离为y1cm,E,F两点间的距离为y2cm.小胜根据学习函数的经验,分别对函数y1,y2随自变量x的变化而变化的规律进行了探究.
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/7bca55fd59744ff0a7b9e5ff5c0d1175.png?resizew=146)
下面是小胜的探究过程,请补充完整:
(1)按照下表中自变量x的值进行取点、画图、测量,得到x与y的几组对应值;
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/809c2804e65448fc907ca39e97788232.png?resizew=431)
(2)在同一平面直角坐标系xOy中,描出补全后的表中各组数值所对应的点(x,y1),(x,y2),并画出函数y1,y2的图象;
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/40445e1be0a3432e97b66f855d048d18.png?resizew=287)
(3)结合函数图象,解决问题:当DE>EF时,AE的长度范围约为多少cm.
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/7bca55fd59744ff0a7b9e5ff5c0d1175.png?resizew=146)
下面是小胜的探究过程,请补充完整:
(1)按照下表中自变量x的值进行取点、画图、测量,得到x与y的几组对应值;
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/809c2804e65448fc907ca39e97788232.png?resizew=431)
(2)在同一平面直角坐标系xOy中,描出补全后的表中各组数值所对应的点(x,y1),(x,y2),并画出函数y1,y2的图象;
![](https://img.xkw.com/dksih/QBM/2019/4/13/2181487312322560/2182829520576512/STEM/40445e1be0a3432e97b66f855d048d18.png?resizew=287)
(3)结合函数图象,解决问题:当DE>EF时,AE的长度范围约为多少cm.
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解题方法
【推荐3】如图,点P是半圆
弧上一动点,连接AP,作∠APC=45°,交弦AB于点C.AB=6cm.小元根据学习函数的经验,分别对线段AP,PC,AC的长度进行了测量.下面是小元的探究过程,请补充完整:
(1)下表是点P是
上的不同位置,画图、测量,得到线段AP,PC,AC长度的几组值,如下表:
![](https://img.xkw.com/dksih/QBM/2020/3/8/2422121180717056/2433767753940992/STEM/7f826097038c4fdf932c66ea57a8970b.png?resizew=527)
①经测量m的值是(保留一位小数).
②在AP,PC,AC的长度这三个量中,确定 的长度是自变量, 的长度和的长度都是这个自变量的函数;
(2)在同一平面直角坐标系xOy中,画出(1)中所确定的函数图象;
(3)结合函数图象,解决问题:当△ACP为等腰三角形时,AP的长度约为 cm(保留一位小数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/0f4a7acb-de08-4f3e-bb05-d4dce35a93f7.png?resizew=168)
(1)下表是点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/2020/3/8/2422121180717056/2433767753940992/STEM/7f826097038c4fdf932c66ea57a8970b.png?resizew=527)
①经测量m的值是(保留一位小数).
②在AP,PC,AC的长度这三个量中,确定 的长度是自变量, 的长度和的长度都是这个自变量的函数;
(2)在同一平面直角坐标系xOy中,画出(1)中所确定的函数图象;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/ec7a76c1-458d-4e0c-991d-3dcb1835572a.png?resizew=222)
(3)结合函数图象,解决问题:当△ACP为等腰三角形时,AP的长度约为 cm(保留一位小数).
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