如图,已知直线y=kx+b与坐标轴分别交于点A(0,8)、B(8,0),动点 C从原点O出发沿OA方向以每秒1个单位长度向点A运动,动点D从点B出发沿BO方向以每秒1个单位长度向点O运动,动点C、D同时出发,当动点D到达原点O时,点C、D停止运动,设运动时间为t 秒.
![](https://img.xkw.com/dksih/QBM/2016/8/12/1574229076664320/1574229082734592/STEM/1d1435fa3d90413c87e791ba291e7eb3.png)
(1)直接写出直线的解析式: ;
(2)若E点的坐标为(﹣2,0),当△OCE的面积为5 时.
①求t的值;
②探索:在y轴上是否存在点P,使△PCD的面积等于△CED的面积?若存在,请求出P点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/8/12/1574229076664320/1574229082734592/STEM/1d1435fa3d90413c87e791ba291e7eb3.png)
(1)直接写出直线的解析式: ;
(2)若E点的坐标为(﹣2,0),当△OCE的面积为5 时.
①求t的值;
②探索:在y轴上是否存在点P,使△PCD的面积等于△CED的面积?若存在,请求出P点的坐标;若不存在,请说明理由.
更新时间:2016-12-06 13:20:10
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【知识点】 几何问题(一次函数的实际应用)解读
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【推荐1】如图,在平面直角坐标系中,直线
与
轴交于点
,点
在直线
上,点
是线段
上的一个动点,过点
作
轴交直线
点
,设点
的横坐标为
.
![](https://img.xkw.com/dksih/QBM/2020/2/13/2398190418632704/2399022733082624/STEM/faa09870b33949d3bd95e4bb7fddf8d8.png?resizew=209)
(1)
的值为 ;
(2)用含有
的式子表示线段
的长;
(3)若
的面积为
,求
与
之间的函数表达式,并求出当
最大时点
的坐标;
(4)在(3)的条件下,把直线
沿着
轴向下平移,交
轴于点
,交线段
于点
,若点
的坐标为
,在平移的过程中,当
时,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db3d27053d888b05d886485a9fdbe65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31c4f39399ec245a67db2933ed639f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99ec9f6a0bec41cb7f0da2d272c26d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257a3b0457aa9b1aa1deee83d9e12074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2020/2/13/2398190418632704/2399022733082624/STEM/faa09870b33949d3bd95e4bb7fddf8d8.png?resizew=209)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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(4)在(3)的条件下,把直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec55a51b96508ae6ccae02f580b1249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】如图,直线l1:y=
x-4分别与x轴,y轴交于A,B两点,与直线l2交于点C(-2,m).点D.是直线l2与y轴的交点,将点A向上平移3个单位,再向左平移8个单位恰好能与点D重合.
(1)求直线l2的解析式;
(2)已知点E(n,-2)是直线l1上一点,将直线l2沿x轴向右平移.在平移过程中,当直线l2与线段BE有交点时,求平移距离d的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求直线l2的解析式;
(2)已知点E(n,-2)是直线l1上一点,将直线l2沿x轴向右平移.在平移过程中,当直线l2与线段BE有交点时,求平移距离d的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/1/4/2111565505134592/2115065400213504/STEM/3dfbe9a3b8d14280bcbb99fb6acbc0b9.png?resizew=156)
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