如图,已知点
是线段
上一点,且
,点
是
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/d7f3cb71-6f92-4e48-8413-52fa476397a5.png?resizew=254)
(1)求
的长;
(2)若点
是线段
上一点,且
,求
的长.
![](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/0b6c335ce6d93ec0eba323f43412b5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/d7f3cb71-6f92-4e48-8413-52fa476397a5.png?resizew=254)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65992661f8e254fe1af0f4dac215f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
更新时间:2023-12-26 00:54:06
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相似题推荐
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【推荐2】已知:如图,点M是线段
上一定点,
,C、D两点分别从M、B出发以
、
的速度沿直线
向左运动,运动方向如箭头所示(C在线段
上,D在线段
上)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/679f8b0a-1a99-49bd-9235-1f9b268368d7.png?resizew=372)
(1)若
,当点C、D运动了
,此时
,
;(直接填空)
(2)当点C、D运动了
,求
的值;
(3)若点C、D运动时,总有
,则
;(直接填空)
(4)在(3)的条件下,
是直线
上一点,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e04947c608f4b7f67b18e8decb05f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e5acdedbab4bba6a4f5defc72c70b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/679f8b0a-1a99-49bd-9235-1f9b268368d7.png?resizew=372)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0446629953f04ec0934167cfa0f66326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b7a662db44251ff09d2bc4cd5574bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b3373b9184f33b33addde0e65ca17b.png)
(2)当点C、D运动了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b7a662db44251ff09d2bc4cd5574bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55a95e6fe821a54c2d81abea63f7964.png)
(3)若点C、D运动时,总有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a192f4806b16d03e754913f5a6be76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
(4)在(3)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77c48fee5061a11bd0494a6e02db8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49dd567df3de72a3fe985596462bc51.png)
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【推荐3】小明在学习了比较线段的长短时对下面一道问题产生了探究的兴趣:
如图1,点C在线段
上,M、N分别是
、
的中点.若
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/78924cbf-6d93-4a01-b178-4f6befe2e361.png?resizew=302)
(1)根据题意,小明求得
__________;
(2)小明在求解(1)的过程中,发现
的长度具有一个特殊性质,于是他先将题中的条件一般化,并开始深入探究.
设
,点C是线段
上任意一点(不与点A,B重合),小明提出了如下两个问题,请你帮助小明解答.
①如图1,M、N分别是
、
的中点,求
的长.
②如图2,M、N分别是
,
的一个三等分点,且
,
,则
_______.
如图1,点C在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/78924cbf-6d93-4a01-b178-4f6befe2e361.png?resizew=302)
(1)根据题意,小明求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
(2)小明在求解(1)的过程中,发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①如图1,M、N分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②如图2,M、N分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2367daecf780285b02961fb4cf529dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429eeaea060418fbf1d3540d929cef78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/766b1866-590d-4cb8-9604-f9a075b416e1.png?resizew=310)
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【推荐1】小学里我们都学过乘法分配律的逆运算:
,它在我们初中有理数运算及今后所学的数与式的运算中也适用,甚至可以推广到几何里面.如果我们把a用
来表示,则上述式子可改成
,用文字可以简单地写为:两数各一半的和(差)等于这两数和(差)的一半.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/7258eab6-a071-4a79-b217-48eca87a9b18.png?resizew=438)
(1)如图①,已知线段
上有两点C、D,
,
,M、N分别为
的中点,则线段
___________
;K为线段
的中点,则线段
___________
,线段
___________
.
(2)如图②,
平分
平分
,求
的度数,写出解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99eba4e2e93c8e95733ff67d3f1969e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2e3381ead0d7df3249d8aed455dff2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/7258eab6-a071-4a79-b217-48eca87a9b18.png?resizew=438)
(1)如图①,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320c1c274e04dd18503c12a075bf146a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a430f3555291fc3b7c61a0189250704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeda89601db5178bf6f48eb93ef5820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693fcf0cfc28f9442c0eed601e2bfc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06663d0ebd692b945269bf732e09d2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a017ba452e51609a97048aa4187c932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb9bfd2312b6d53061a86ebbbafb340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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【推荐2】(1)如图1,在直线
上,点
在
、
两点之间,点
为线段PB的中点,点
为线段
的中点,若
,且使关于
的方程
无解.
①求线段
的长;
②线段
的长与点
在线段
上的位置有关吗?请说明理由;
(2)如图2,点
为线段
的中点,点
在线段
的延长线上,试说明
的值不变.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7be5da220f32cb7c8aad9ca5ced32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d4ec6126ff55b10dbd3a52fe893848.png)
①求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b60dc201bc711565d416abbaed5439.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/8d8eb3c0-254d-4b3d-8b6d-86bf76f4c0c3.png?resizew=245)
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【推荐3】如图①,已知线段AB=18cm,CD=2cm,线段CD在线段AB上运动,E,F分别是AC,BD的中点.
(1)若AC=4cm,则EF= cm;
(2)当线段CD在线段AB上运动时,试判断EF的长度是否发生变化?如果不变,请求出EF的长度,如果变化,请说明理由.
(3)a.我们发现角的很多规律和线段一样,如图②,已知∠COD在∠AOB内部转动,OE,OF分别平分∠AOC和∠BOD,若∠AOB=140°,∠COD=40°,求∠EOF.
b.由此,你猜想∠EOF,∠AOB和∠COD会有怎样的数量关系 .(直接写出猜想即可)
![](https://img.xkw.com/dksih/QBM/2021/8/14/2785806151622656/2786019746439168/STEM/ff473de7-d0b0-4cb9-a413-f3e04a7ec048.png)
(1)若AC=4cm,则EF= cm;
(2)当线段CD在线段AB上运动时,试判断EF的长度是否发生变化?如果不变,请求出EF的长度,如果变化,请说明理由.
(3)a.我们发现角的很多规律和线段一样,如图②,已知∠COD在∠AOB内部转动,OE,OF分别平分∠AOC和∠BOD,若∠AOB=140°,∠COD=40°,求∠EOF.
b.由此,你猜想∠EOF,∠AOB和∠COD会有怎样的数量关系 .(直接写出猜想即可)
![](https://img.xkw.com/dksih/QBM/2021/8/14/2785806151622656/2786019746439168/STEM/ff473de7-d0b0-4cb9-a413-f3e04a7ec048.png)
![](https://img.xkw.com/dksih/QBM/2021/8/14/2785806151622656/2786019746439168/STEM/1d86b004-2341-4a91-a2ce-12f672c3254b.png)
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