如图,在平面直角坐标系中,点O为坐标原点,点A在y轴上,点B,C在x轴上,
,
,
.
(1)求线段AC的长;
(2)点P从C点出发沿射线CA以每秒2个单位长度的速度运动,过点A作
,点F在y轴的左侧,
,过点F作
轴,垂足为E,设点P的运动时间为t秒,请用含t的式子表示EF的长;
(3)在(2)的条件下,直线BP交y轴于点K,
,当
时,求t的值,并求出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee07d86765c4fb74ac647742f16bd57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7f7af91a77685074840cfee7843b13.png)
(1)求线段AC的长;
(2)点P从C点出发沿射线CA以每秒2个单位长度的速度运动,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfcd675c10cbf967cdb2247bfe49929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcb03ce56e93adeb4ef20db3809aa45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e35b52a747117de2e0da7e1567bea22.png)
(3)在(2)的条件下,直线BP交y轴于点K,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f237d8bf1d1a1dcb5e7e2968a2db7ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e347908ee04e837faef5e8ff9bf8af.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2890058148929536/2891989428035584/STEM/6f499f1b-2bf5-45fe-9dc5-b3ff10eb16fe.png?resizew=758)
更新时间:2022-01-11 08:30:27
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【推荐1】如图所示,再平面直角坐标系中,点A,B的坐标分别为
,
,
,点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/b6f960ca-500b-456f-8d1d-7288129aa25f.png?resizew=174)
(1)求a,b的值;
(2)求
;
(3)若点M在坐标轴上,且
,直接写出M的坐标;
(4)点D的坐标为
,动点P在x轴上,当
试等腰三角形,请直接写出所有符合条件的点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9486ec9dca95979803bf91ca6c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5703348356850ab559f7f062ab668c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0475ec89f166d6faa6cc1d42c027a672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fed700b7a3ab2ee7fbae12507033af9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/b6f960ca-500b-456f-8d1d-7288129aa25f.png?resizew=174)
(1)求a,b的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3380122485dbd7ac6be49ba3261e0de3.png)
(3)若点M在坐标轴上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7fd3525eae3ce292923c52dc854063.png)
(4)点D的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4894758370b77a9d08752b63c1cd55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
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【推荐2】(1)在平面直角坐标系中,点 B 的坐标是
,且满足等式
求点 B 的坐标.
(2)如图 1,点
,点
,D 是 CE 上一点,连接
、
,
、
相交于点 F,若
,求证:点 F 的坐标.
(3)如图 3,M 是 y 轴正半轴上任意一点,过点 B 在
下方做
,且
,连接
,则
的最小值为 .(直接写结果,不需要过程)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ca6fa36e9c5e6dc2ef5e501d201f89.png)
(2)如图 1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc03fafb03395ed84030f03c5d93aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05efa50a5046532028ff5e6eb6467e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88771dd366d7df190e3863b442f055b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4118371d533ddb58493abcaf8dcb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/c308c396-01cf-468c-93d8-16f535d53e2f.png?resizew=164)
(3)如图 3,M 是 y 轴正半轴上任意一点,过点 B 在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a8b783f814a4226167448bc6777769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ec1827a09872159663c8d1998a0ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/62055654-a4a3-4020-a15d-6f3fc678a6f0.png?resizew=141)
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【推荐3】【问题情境】
小明在探究平面直角坐标系中图形的平移规律的综合实践课上,作了如下操作.
如图1,他在平面直角坐标系的坐标轴上选取了两点
,
,并用直尺过
,
两点画出直线
,他发现直线
上的任意一点沿直线
移动时,其坐标变化是有规律的.
【发现规律】
(1)将点
沿此直线移动到点
时,横坐标增加了2个单位长度,纵坐标减少了__________个单位长度;将点
沿此直线移动到点
时,横坐标增加了1个单位长度,纵坐标减少了__________个单位长度;因此,他归纳:将直线
上任意一点
沿直线
平移至点
,若点
的横坐标为
,则点
的纵坐标为__________(用含
,
的式子表示);
【规律运用】
(2)如图2,三角形
的一边
与直线
重合,三角形
三个顶点坐标为
,
,
,将三角形
沿直线
平移至三角形
,其中点
的对应点是点
,点
的对应点是点
,点
的对应点是点
,求点
的坐标.((1)中规律可直接使用)
【拓展探究】
(3)①小明在图2中画出三角形
,并连接平移前后的三对对应顶点,他发现连接各组对应点的线段具有____________的位置关系.
②连接
,
,请直接写出三角形
的面积为__________.
小明在探究平面直角坐标系中图形的平移规律的综合实践课上,作了如下操作.
如图1,他在平面直角坐标系的坐标轴上选取了两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9794b90c7775769f5ecfe86d1b4d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f605a7fc2f1064fe14882ee426839db.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【发现规律】
(1)将点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0fa712328b9dc9a4938441a1a4bae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299b0531ace62e0752934030d0e7e4af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c1b43d54d446ff1e4488a74c4bf46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
【规律运用】
(2)如图2,三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dc0f16a02e53c12cc61cb63fbc65b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67864f2276863eb8ad254c71400a3c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b07342bc61e85172663ff59973c3cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1828e73ec5e00f95aa11ff74c703a5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9f97d3d1c03eee0d2807206a8ca915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b8d7181d4d7d2757f128e6ab8dcb73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
【拓展探究】
(3)①小明在图2中画出三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1828e73ec5e00f95aa11ff74c703a5c1.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9b798a71ae94839e1ebb0a644202e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e446a037490693b201a4ad3cfc6502.png)
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【推荐1】综合与实践:
数学模型可以用来解决一类问题,是数学应用的基本途径.通过探究图形的变化规律,再结合其他数学知识的内在联系,最终可以获得宝贵的数学经验,并将其运用到更广阔的数学天地.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/af191bb5-cbe6-4688-9549-5bff3285e117.png?resizew=444)
(1)发现问题:如图1,在
和
中,
,
,
,连接
,
,延长
交
于点
.则
与
的数量关系: ,
;
(2)类比探究:如图2,在
和
中,
,
,
,连接
,
,延长
,
交于点
.请猜想
与
的数量关系及
的度数,并说明理由;
(3)拓展延伸:如图3,
和
均为等腰直角三角形,
,连接
,
,且点
,
,
在一条直线上,过点
作
,垂足为点
.则
,
,
之间的数量关系: ;
(4)实践应用:正方形
中,
,若平面内存在点
满足
,
,则
.
数学模型可以用来解决一类问题,是数学应用的基本途径.通过探究图形的变化规律,再结合其他数学知识的内在联系,最终可以获得宝贵的数学经验,并将其运用到更广阔的数学天地.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/af191bb5-cbe6-4688-9549-5bff3285e117.png?resizew=444)
(1)发现问题:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d0dd547921b8a35acf7b407fac21b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c3c112368d374afe3c2f8a4a1ce29c.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2ee144fbda9152177857f19d5aaede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(3)拓展延伸:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a93128719573a60a1bdcf0ede1116b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396632dba26d326a6b69f0bb7016bd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(4)实践应用:正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d5974e8669eb588401203de18a3ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cde75c806c60b4319ba2c1bc2f3dc91.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在正方形中,点P为
延长线上一点,连接
.
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294543867682eca41819a6a2305bf5cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a016bd561e8a5e9a28eb0833ba16c570.png)
(2)如图2,点F在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7316430d26a6f4bcc0bdadfd1a5330a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae918590e4b7526281bf03abff95b0a.png)
(3)如图3,在(2)的条件下,点Q为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c223ffbb8d352e5ba769035ceb97ce8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7939d617fb925073478358db45cd792d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19324d9bb7f74e7d7bda648642a7fc5e.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】如图,四边形
为菱形,
,
,点E为边
上动点(不含端点)点B关于直线
的对称点为点F,点H为
中点.
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777445498044416/2785319455408128/STEM/2d30f6eb-7d8c-4b68-80c0-7294c536df84.png)
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777445498044416/2785319455408128/STEM/c76a823a-59a6-462f-9e16-b186871ac749.png)
(1)若
,求
的长;
(2)作
,垂足为G,当
时,求
的度数;
(3)在(2)的条件下,设射线
交
于M,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777445498044416/2785319455408128/STEM/2d30f6eb-7d8c-4b68-80c0-7294c536df84.png)
![](https://img.xkw.com/dksih/QBM/2021/8/2/2777445498044416/2785319455408128/STEM/c76a823a-59a6-462f-9e16-b186871ac749.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37c334e0b3e43d11087a1c4880c1775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2080483cf8503a84cdd84e19392fc4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
(3)在(2)的条件下,设射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,
是边长是
的等边三角形,动点
同时从A,B两点出发,分别沿
方向 匀速运动,其中点P运动的速度是
,点Q运动的速度是
,当点Q到达点C时,
两点都停止运动,设运动时间为t(s),解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/554a98f3-0e5d-4b4d-b31a-20e50350d707.jpg?resizew=114)
(1)当点Q到达点C时,
与
的位置关系如何?请说明理由.
(2)在点P与点Q的运动过程中,
是否能成为等边三角形?若能,请求出t,若不能,请说明理由.
(3)当t为何值时,
是直角三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d5249a8db3920bdde5fee61d5c287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d5249a8db3920bdde5fee61d5c287.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/554a98f3-0e5d-4b4d-b31a-20e50350d707.jpg?resizew=114)
(1)当点Q到达点C时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在点P与点Q的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】(1)如图①,已知
是等边三角形.
、
分别为边
、
的中点,连接
、
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/bcd1b70d-d3b1-4cc6-9f87-0bcf1873b0b6.png?resizew=117)
①
的度数为______;
②直接写出线段
、
、
之间的数量关系;
(2)若点
是边
所在射线
上一动点
.按下列步骤画图:
①连接
,作点
关于
所在直线对称的点
,连接
;
②作射线
,交
所在直线于点
.
小明所做的图形如图②所示,他猜想:
下面是小明未写完的证明过程:如图②,延长
到点
,使
,连接
.请你将小明的证明过程补充完整;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/44194b44-8510-48a7-81f1-f345c519b139.png?resizew=167)
(3)小华同学在按上述步骤画图时,把点
标在了边
的延长线上,如图③小华测量得到
,
,请直接写出
的长,不用说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/bcd1b70d-d3b1-4cc6-9f87-0bcf1873b0b6.png?resizew=117)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18f62a54d8350b36644068c0314d335.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
小明所做的图形如图②所示,他猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9710213bf413f4c4ba26d80e87afeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0b61e2e34355bfa635d1705a0dbfcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/44194b44-8510-48a7-81f1-f345c519b139.png?resizew=167)
(3)小华同学在按上述步骤画图时,把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7525c2d0fd8cec7ea0ed83260a73b917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a0e8881c3aa3ef958e2dec8b6764ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/7cef3aa6-d074-4793-9301-017ee6ca288d.png?resizew=161)
您最近一年使用:0次