如图,已知直线
与y轴相较于点
,直线
交y轴于点B,交直线
于点
.
(1)求直线
的解析式;
(2)过动点
作x轴的垂线,与直线
相交于点M,与直线
相交于点N,当
时,求a的值;
(3)点Q为
上一点,若
,直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f94c4f6b762fddb0e313050ef6932eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0651edf13c85caa027973dd77cf05a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2c90a33402cc31095fe789f31ada8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/9b32d3e2-88a0-402f-850a-f2f7da5a0bce.png?resizew=174)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(2)过动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b188d0793b182d808af1f3ba3dd5e2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e47bb98258ebfcf1d8ad4bac10b7ba.png)
(3)点Q为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bb936d01dc8031dc1d06f0aed3f442.png)
22-23八年级下·河北承德·期末 查看更多[5]
河北省承德市宽城县2022-2023学年八年级下学期期末数学试题(已下线)专题8.4 期末复习之解答压轴题十二大题型总结-2023-2024学年八年级数学上册举一反三系列(北师大版)(已下线)专题7.4 期末复习之解答压轴题十三大题型总结-2023-2024学年八年级数学上册举一反三系列(苏科版)(已下线)专题6.4+02期末复习之解答压轴题十八大题型总结-2023-2024学年八年级数学上册举一反三系列(浙教版)(已下线)专题16.4 期末复习之解答压轴题十三大题型总结-2023-2024学年八年级数学上册举一反三系列(沪科版)
更新时间:2023-07-16 18:38:53
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名校
【推荐1】如图1,在平面直角坐标系中,已知
、
、
、
,以
为边在
下方作正方形
.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2892196058742784/2897675223834624/STEM/fc4450a3-6c19-4f00-bd21-688dd1b71d5d.png?resizew=690)
(1)求直线
的解析式;
(2)点
为正方形边上一点,若
,求
的坐标;
(3)点
为正方形边上一点,
为
轴上一点,若点
绕点
按顺时针方向旋转
后落在线段
上,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5d3436cf807f6c1d69e05a881bd0fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c9cc823b331f0c211c1541d9bdb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb4089c0b6b1dd6d46bfc40803bacd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5d579b3d96c30496c787eccb8bb85b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://img.xkw.com/dksih/QBM/2022/1/1/2892196058742784/2897675223834624/STEM/fc4450a3-6c19-4f00-bd21-688dd1b71d5d.png?resizew=690)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b860d551c58252fbf233eae434076e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9b8f4065fdf8cd63217916b27d2ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图,在平面直角坐标系中,矩形
的边
落在x轴上,点B的坐标为
,
,
,边
与y轴交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/d4bafd46-0def-4922-b43c-fd39f03fc683.png?resizew=191)
(1)点A坐标______;点C坐标______;
(2)在x轴上取点
,直线
经过点E,与x轴交于点M,连接
.
①当
时,求直线
的函数表达式;
②当以线段
为直径的圆与矩形
的边所在直线相切时,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/d4bafd46-0def-4922-b43c-fd39f03fc683.png?resizew=191)
(1)点A坐标______;点C坐标______;
(2)在x轴上取点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7b07ace87ed58fdc1f1bc78a04aeda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d501afbd7542f2f724b658edf39af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af868306b780a2c35abe3afc1139fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d501afbd7542f2f724b658edf39af4.png)
②当以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,
的顶点坐标分别为
,动点P、Q同时从点O出发,分别沿x轴正方向和y轴正方向运动,速度分别为每秒3个单位和每秒2个单位,点P到达点B时点P、Q同时停止运动.过点Q作
分别交
于点M、N,连接
.设运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/26bd56ce-9fc9-427a-adbd-e84cf31211fc.png?resizew=181)
(1)求点M的坐标(用含t的式子表示);
(2)求四边形
面积的最大值;
(3)连接
,当
时,求点N到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9906af750296e852fc38c83e52840e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccfc2b8ed3871df1b02a12ffbb38084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d67fcab1dfca9eb397303310ae2c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c77d91658d543ffc84e8a3dfbfb984.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/26bd56ce-9fc9-427a-adbd-e84cf31211fc.png?resizew=181)
(1)求点M的坐标(用含t的式子表示);
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91c4c08a80b24a8068ae397b97521b7.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e266f45b2189462b6ade21cf9177787c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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【推荐2】如图,直线
与
轴,
轴分别交于点
,
.点
在
轴正半轴上,把
沿
折叠,点
恰好落在
轴负半轴上的点
处.直线
交直线
于点
.点
是
轴正半轴上的一动点,点
是直线
上的一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/8d753501-336d-4c16-84c7-dee033b9b3c2.png?resizew=300)
(1)填空:点
,
,
坐标分别为
___________;
___________;
___________.
(2)求
的面积.
(3)连结
.
与
全等(点
与点
不重合),直接写出所有满足条件的点
坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bb80c6d18691920bb7c174f04940f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd143894dbc98d9a4e5973ea15a17978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/8d753501-336d-4c16-84c7-dee033b9b3c2.png?resizew=300)
(1)填空:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.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/acc290b44635265137fdf13146b6a6d9.png)
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【推荐1】在平面直角坐标系
中,对于任意两个图形T和图形W,给出如下定义:M,N分别为图形T和图形W上任意一点,将M,N两点间距离的最小值称为图形T和图形W之间的“关联距离”,记作
.如图,已知
,其中
,
,
,D,E为三角形外两点.例如,点A与x轴之间的“关联距离”
,线段
与y轴之间的“关联距离”
.
之间的“关联距离”
;
(2)若
,
,将线段
向左平移n个单位,当线段
与
之间的“关联距离”
时,求n的最小值;
(3)若
,
,当
时,对于每一个m,都满足线段
与一次函数
(k是常数,
)的图象之间的“关联距离”
,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/805275075f5d1a459632ba12bec8c7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d82ce1b2ab811e07c2a9aee798958ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091c4cb2c7621ab73b0eb63d02f5d2ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e71cc0231c4b6393a3a94c27782fb76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8191de0bd4064fa7ea3c7422beb7b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfae7398f342e4d141d8c5277aed9ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d9df966d663526a080230d1ed723d2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be728272aba9c2bd7e1ab1fee9726c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a694b4302d1f84845b29cfac00b359c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb07b345db36cda9c37576fe8fa8c5a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de79eb6866845697e8f380ad7d8c1c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ef174e4aac0cc7fa05dc514e6af26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e467f19edb0c9a05c3fb7e9e754c984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212d499bc3042676d7fe366e3f1cf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9878d4e48cd71f4d9cc1599608341.png)
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【推荐2】某工地需要利用炸药实施爆破,操作人员点燃导火线后,要在炸药爆炸前跑到300米以外的安全区域,炸药导火线的长度y(厘米)与燃烧的时间x(秒)之间的函数关系如图所示.
(1)请写出点B的实际意义,
(2)求y与x之间的函数关系式,并写出自变量的取值范围.
(3)问操作人员跑步的速度必须超过多少,才能保证安全.
(1)请写出点B的实际意义,
(2)求y与x之间的函数关系式,并写出自变量的取值范围.
(3)问操作人员跑步的速度必须超过多少,才能保证安全.
![](https://img.xkw.com/dksih/QBM/2019/5/17/2205450021978112/2207965246308352/STEM/d00e0321958b474aa717e4c17379950d.png?resizew=137)
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【推荐3】中共中央办公厅、国务院办公厅印发《关于进一步减轻义务教育阶段学生作业负担和校外培训负担的意见》.某学校积极响应“双减”政策,为了丰富学生校园生活,经研究决定准备购头一批体育健身器材,已知购买2个篮球和3个排球共花费440元,购买4个篮球和1个排球共花费480元.
(1)求篮球和排球的单价;
(2)某体育用品店有两种优惠方案,
方案一:每购买一个篮球就送一个排球;
方案二:购买篮球和排球的费用一律打七五折,该学校需要购买40个篮球和x个排球
.
方案一的费用为
元,方案二的费用为
元.
①根据题目信息,直接写出
与x的的函数表达式______;
与x的函数表达式______;
②请根据购买排球的数量x设计一种比较省钱的购买方案.
(1)求篮球和排球的单价;
(2)某体育用品店有两种优惠方案,
方案一:每购买一个篮球就送一个排球;
方案二:购买篮球和排球的费用一律打七五折,该学校需要购买40个篮球和x个排球
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12a935a3f3704f8b36d23cb62af87e1.png)
方案一的费用为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
①根据题目信息,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
②请根据购买排球的数量x设计一种比较省钱的购买方案.
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【推荐1】如图,点C,D,E在线段
上,线段
,C是线段
上靠近点A的三等分点.点E为线段
的中点,且图中所有线段的长度和是线段
的长度的10倍,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c99d77dc7fdbd9823e1b488b7e2560b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/11/26/3118142517927936/3119382687039488/STEM/d2c5af7060c2461497e4c28295682c91.png?resizew=355)
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【推荐2】如图,C是线段AB上一点,AB=12cm,AC=4cm,P、Q两点分别从A、C出发以1cm/s、2cm/s的速度沿直线AB向右运动,运动的时间为ts.
![](https://img.xkw.com/dksih/QBM/2022/2/26/2924636265660416/2926808673460224/STEM/2f67515d-fa57-4f44-8e65-5525cf3b2f18.png?resizew=579)
(1)当t=1s时,CP= cm,QB= cm;
(2)当运动时间为多少时,PQ为AB的一半?
(3)当运动时间为多少时,BQ=AP?
![](https://img.xkw.com/dksih/QBM/2022/2/26/2924636265660416/2926808673460224/STEM/2f67515d-fa57-4f44-8e65-5525cf3b2f18.png?resizew=579)
(1)当t=1s时,CP= cm,QB= cm;
(2)当运动时间为多少时,PQ为AB的一半?
(3)当运动时间为多少时,BQ=AP?
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【推荐3】如图,数轴上线段AB=2(单位长度),CD=4(单位长度),点A在数轴上表示的数是﹣8,点C在数轴上表示的数是10,若线段 AB以6个单位长度/秒的速度向右匀速运动,同时线段CD以2个单位长度/秒的数度也向右匀速运动.
(1)运动t秒后,点B表示的数是 ;点C表示的数是 ;(用含有t的代数式表示)
(2)求运动多少秒后,BC=4(单位长度);
(3)P是线段AB上一点,当B点运动到线段CD上,且点P不在线段CD上时,是否存在关系式 BD﹣AP=3PC.若存在,求线段PD的长;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/c8b0bb65-25b1-4582-85d9-fd8e7b88f6b5.png?resizew=208)
(1)运动t秒后,点B表示的数是 ;点C表示的数是 ;(用含有t的代数式表示)
(2)求运动多少秒后,BC=4(单位长度);
(3)P是线段AB上一点,当B点运动到线段CD上,且点P不在线段CD上时,是否存在关系式 BD﹣AP=3PC.若存在,求线段PD的长;若不存在,请说明理由.
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