如图,已知点C在线段AB上,线段AC=12厘米,BC=8厘米,点M,N分别是AC,BC的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/15/2895145311330304/2951777268023296/STEM/9272bd92-08c2-44d4-8861-dd4dab432d1b.png?resizew=303)
(1)求线段MN的长;
(2)根据第(1)题的计算过程和结果,设
,其它条件不变,直接写出MN的长度;
(3)动点P、Q分别从A,B同时出发,点P以2cm/s的速度沿AB向右运动,终点为B,点Q以1cm/s的速度沿BA向左运动,终点为A,当一个点到达终点,另一个点也随之停止运动,设运动时间为
秒,是否存在某一时刻,使得C、P、Q这三个点中,有一个点恰为另外两点所连线段的中点?若存在,求出所有满足条件的
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/15/2895145311330304/2951777268023296/STEM/9272bd92-08c2-44d4-8861-dd4dab432d1b.png?resizew=303)
(1)求线段MN的长;
(2)根据第(1)题的计算过程和结果,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e548490fd2b9d96bfa7621c8dd1ed8d.png)
(3)动点P、Q分别从A,B同时出发,点P以2cm/s的速度沿AB向右运动,终点为B,点Q以1cm/s的速度沿BA向左运动,终点为A,当一个点到达终点,另一个点也随之停止运动,设运动时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2022-04-05 19:49:08
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知
中,
,
,点
为
的中点.
(1)如果点
在线段
上以
的速度由
点向
点运动,同时点
在线段
上由
向
点运动.
①若点
的运动速度与点
的运动速度相等,经过1秒后,
与
是否全等,请说明理由;
②若点
的运动速度与点
的运动速度不相等,当点
的运动速度为多少时,能够使
与
全等?
(2)若点
以②中的运动速度从点
出发,点
以原来的运动速度从点
同时出发,都逆时针沿
三边运动,求经过多长时间点
与点
第一次在
的哪条边上相遇?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab23e3785bd7278d9e7b55131394fa4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9d0d90bf492735a174a88df5704f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/d11f1c44-4397-4365-b5d0-05354cf371e1.png?resizew=128)
(1)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513bc3cdedb68687ef96716718b99b1b.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,点
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上一点
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在线段
上,
,点
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的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/fe4453a0-ad6c-431d-a20a-9de7185d5e51.png?resizew=211)
(1)若
,当
忖,求
的长.
(2)若
,求
的值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)若
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(2)若
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解答题-问答题
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适中
(0.65)
【推荐1】如图AB=48,C为线段AB的延长线上一点,M,N分别是AC,BC的中点.
![](https://img.xkw.com/dksih/QBM/2016/1/22/1573961049432064/1573961055969280/STEM/b2d6e34fffc448b5b2a80999b6755687.png)
(1)若BC=10,求MN的长;
(2)若BC的长度为不定值,其它条件不变,MN的长还是定值吗?若是,请求出MN的长;若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/1/22/1573961049432064/1573961055969280/STEM/b2d6e34fffc448b5b2a80999b6755687.png)
(1)若BC=10,求MN的长;
(2)若BC的长度为不定值,其它条件不变,MN的长还是定值吗?若是,请求出MN的长;若不是,请说明理由.
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解答题-问答题
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适中
(0.65)
【推荐2】已知线段
上,顺次有三个点C,D,E,把线段
成
四部分,且
.
(1)求线段
的长;
(2)若M,N分别是
,
的中点,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/0c840dc7-a6bd-427f-abcc-af1dd299291b.jpg?resizew=240)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(2)若M,N分别是
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