如图,点C为线段AB的中点,点E为线段AB上的点,点D为线段AE的中点.
![](https://img.xkw.com/dksih/QBM/2019/11/1/2324594134401024/2325149034340352/STEM/fc4e07d29c0f4d758fa7ef1044fad575.png?resizew=213)
(1)若线段AB=a,CE=b,且
,求a,b的值;
(2)在(1)的条件下,求线段CD的长.
![](https://img.xkw.com/dksih/QBM/2019/11/1/2324594134401024/2325149034340352/STEM/fc4e07d29c0f4d758fa7ef1044fad575.png?resizew=213)
(1)若线段AB=a,CE=b,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91a85ad179989e5e57e7025eb5937af.png)
(2)在(1)的条件下,求线段CD的长.
19-20七年级上·河北衡水·期中 查看更多[6]
河北省衡水市衡水第一中学2018-2019学年七年级期中数学试题吉林省长春市农安县2020-2021学年七年级上学期期末数学试题湖南省长沙市广益实验中学2020-2021学年七年级上学期第三次月考数学试题广东省汕头市2021-2022学年七年级上学期期末数学试题(已下线)第六章 平面图形的认识(一)(章末测试)-2022-2023学年七年级数学上册同步精品课堂(苏科版)湖南省张家界市永定区2022-2023学年七年级上学期期末教学质量监测数学试题
更新时间:2019-11-02 11:50:43
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解答题-问答题
|
较难
(0.4)
【推荐1】已知:
是最小的正整数,且
,
,
满足
,请回答问题:
(1)请直接写出
,
,
的值.
________,
________,
________.
(2)
,
,
所对应的点分别为
,
,
,若点
、点
分别以每秒1个单位长度和2个单长度的速度向左运动,①运动2秒时,
,
之间的距离为________个单位长度.②请问运动________秒时,
,
之间的距离为1个单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd1736674478e945f21a83ed5a8756.png)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.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/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】已知数轴上A、B、C三个点对应的数分别是a,b,c,且
;动点P从C点出发,向右移动,速度为1个单位长度/秒,设移动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/2d9b9d48-c3e1-4a9f-8ac7-aa28aa5ba0fe.png?resizew=327)
(1)求a,b,c的值;
(2)以
为长,
为宽,作出长方形
,其中M与A重合,N与B重合(如图所示),将这个长方形总绕着右边的端点不断滚动(无滑动),求E点第3次落在数轴上对应的数字;
(3)将(2)中的长方形
,M与A重合,N与B重合时开始计时,该长方形以2个单位长度/秒的速度向左移动.当N点与C点重合时,立即返回向右移动,当M点与A点重合时,立即返回向左移动,N点再次到达C点时停止,整个过程中速度保持不变,当P点与M点相遇时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4c951f227cc82f714fc7fc935ed066.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/2d9b9d48-c3e1-4a9f-8ac7-aa28aa5ba0fe.png?resizew=327)
(1)求a,b,c的值;
(2)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
(3)将(2)中的长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
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【推荐1】如图,正方形
的边长为a,射线
是
外角的平分线,点E在边
上运动(不与点A、B重合),点F在射线
上,且
,
与
相交于点G,连接
.
![](https://img.xkw.com/dksih/QBM/2022/12/13/3130032640352256/3130532779008000/STEM/1923b4923bc4499eb20f2e49d6f37493.png?resizew=253)
![](https://img.xkw.com/dksih/QBM/2022/12/13/3130032640352256/3130532779008000/STEM/4c67df8ad3d94e2d8ca87219e47d4920.png?resizew=261)
(1)试猜想
的形状,并说明理由;
(2)求
的周长(用含a的代数式表示);
(3)试探索:点E在边
上运动至什么位置时,
的面积最大(用含a的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22569e5010fe900eaefc4a025c774b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a6d2f2cc3871b33ac6ffca470a8e02.png)
![](https://img.xkw.com/dksih/QBM/2022/12/13/3130032640352256/3130532779008000/STEM/1923b4923bc4499eb20f2e49d6f37493.png?resizew=253)
![](https://img.xkw.com/dksih/QBM/2022/12/13/3130032640352256/3130532779008000/STEM/4c67df8ad3d94e2d8ca87219e47d4920.png?resizew=261)
(1)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
(3)试探索:点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66eae532e1a1551cfc7b5ff9cfc5aa9.png)
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较难
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【推荐2】已知(2x-1)
=ax
+bx
+cx
+dx
+ex
+fx+g(a,b,c,d,e,f,g均为常数),试求:
(1)a+b+c+d+e+f+g的值;
(2)a-b+c-d+e-f+g的值;
(3)a+c+e+g的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd772dcb78fe35dfe065a6ae989a50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd772dcb78fe35dfe065a6ae989a50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa896c0430b7c86e7ee96a8dbd8f445.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
(1)a+b+c+d+e+f+g的值;
(2)a-b+c-d+e-f+g的值;
(3)a+c+e+g的值;
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解答题-问答题
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较难
(0.4)
【推荐1】如图,直线l上有AB两点,AB=18cm,点O是线段AB上的一点,OA=2OB
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062141992960/1715640177704960/STEM/fcd8d37c-c36e-4f46-b834-bdbc9a593441.png)
(1)OA= cm , OB= cm;
(2)若点C是直线AB上一点,且满足AC=CO+CB,求CO的长;
(3)若动点P,Q分别从A,B同时出发,向右运动,点P的速度为2cm/s,点Q的速度为1cm/s.设运动时间为ts,当点P与点Q重合时,P,Q两点停止运动.
①当t为何值时,2OP﹣OQ=3;
②当点P经过点O时,动点M从点O出发,以4cm/s的速度也向右运动.当点M追上点Q后立即返回,以4cm/s的速度向点P运动,遇到点P后再立即返回,以4cm/s的速度向点Q运动,如此往返.当点P与点Q重合时,P,Q两点停止运动.此时点M也停止运动.在此过程中,点M行驶的总路程是多少?
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625062141992960/1715640177704960/STEM/fcd8d37c-c36e-4f46-b834-bdbc9a593441.png)
(1)OA= cm , OB= cm;
(2)若点C是直线AB上一点,且满足AC=CO+CB,求CO的长;
(3)若动点P,Q分别从A,B同时出发,向右运动,点P的速度为2cm/s,点Q的速度为1cm/s.设运动时间为ts,当点P与点Q重合时,P,Q两点停止运动.
①当t为何值时,2OP﹣OQ=3;
②当点P经过点O时,动点M从点O出发,以4cm/s的速度也向右运动.当点M追上点Q后立即返回,以4cm/s的速度向点P运动,遇到点P后再立即返回,以4cm/s的速度向点Q运动,如此往返.当点P与点Q重合时,P,Q两点停止运动.此时点M也停止运动.在此过程中,点M行驶的总路程是多少?
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【推荐2】如图,线段AB上有两点P,Q,点P将AB分成两部分,AP=
PB,点Q将AB也分成两部分,AQ=4QB,PQ=3 cm,求AP,QB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://img.xkw.com/dksih/QBM/2017/10/25/1802761278857216/1804272035512320/STEM/55954c8f1d674ceabc86d1ba7c3c3cb1.png?resizew=155)
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名校
【推荐1】如图①,已知线段
,
,线段
在线段
上运动,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/8/a7997037-cc5e-4573-ba29-d2b879e1f383.png?resizew=238)
(1)若
,则
______
;
(2)当线段
在线段
上运动时,试判断
的长度是否发生变化?如果不变请求出
的长度,如果变化,请说明理由;
(3)我们发现角的很多规律和线段一样,如图②已知
在
内部转动,
、
分别平分
和
,则
、
和
有何数量关系,请直接写出结果不需证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc9018fd90522f3e6df4fbdf3c1b88d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b5f8acda412ddceb94c4e4e6b7f0.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/8/a7997037-cc5e-4573-ba29-d2b879e1f383.png?resizew=238)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当线段
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)我们发现角的很多规律和线段一样,如图②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/8/0e80d1ec-fd30-40d2-a4eb-f4a99122bd2e.png?resizew=120)
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【推荐2】线段AB上有一点M,在三条线段AB、AM和BM中,若有一条线段的长度是另一条线段长度的三分之一,则称点M是线段AB的“奇异点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/c2712bd7-c33f-45b1-a488-6e11e8859b04.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/4ea27f5b-c30c-41ac-9052-3a43d12da9b5.png?resizew=257)
(1)如图1,线段
厘米,若点
是线段
的“奇异点”,求AM的长.
(2)如图2,线段
厘米,一个动点
从点
出发,以每秒3厘米的速度沿射线
匀速运动.当点
运动几秒时,点
恰好是线段
的“奇异点”?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/c2712bd7-c33f-45b1-a488-6e11e8859b04.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/4ea27f5b-c30c-41ac-9052-3a43d12da9b5.png?resizew=257)
(1)如图1,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a1f73190215b1c9d45a3dd9e6b66ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c0a8cc052f67b4eee1e43f2e5ed659.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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