如图1:在
中,
,(要求:点
在
上,点
在
上;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)直角坐标系的建立,在代数和几何之间架起了一座桥梁,用代数的方法解决几何问题:某数学小组在自主学习时了解了三角形的中位线及相关的定理,在学习了相关知识后,该小组同学深入思考,利用中点坐标公式,给出了三角形中位线定理的另外一种证明方法.该数学小组建立如图2所示的直角坐标系,已知点
,
分别是
,
边的中点,不妨设点
,点
,
.请你利用该数学学习小组的思路证明
且
.(提示:中点坐标公式,
,
,
,
,则
,
中点坐标为
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bf335d98f98e40e3d300487f1396ef.png)
(3)如图3:在
中,
,
,
,延长
至点
,
,连接
并延长
边于点
,若
,则
是否存在最小值,若存在求出最小值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)直角坐标系的建立,在代数和几何之间架起了一座桥梁,用代数的方法解决几何问题:某数学小组在自主学习时了解了三角形的中位线及相关的定理,在学习了相关知识后,该小组同学深入思考,利用中点坐标公式,给出了三角形中位线定理的另外一种证明方法.该数学小组建立如图2所示的直角坐标系,已知点
![](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/7903097d9663549d86e6267da59537a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c6df9a988e7dd779f1e8557bae298b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479985bb72d69f9a421ae9af76ed651c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5a54e0b4872cabdc0b07ea9380e4de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a350eb41c3b7e4face9c3299eff9d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8e72f73db207c3040f143d837d5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24529eadaef974ec0625f8ca40682e51.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/c32a8ce836efaa851353436342ae1f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bf335d98f98e40e3d300487f1396ef.png)
(3)如图3:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ff4468bd547f79536e626432c6c113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2024-04-22 13:10:54
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】在平面直角坐标系中,直线
(
为常数).
(1)当
时,直线
与坐标轴围成的三角形的面积为______.
(2)当
时,求图象的最高点与最低点的纵坐标的差;
(3)点
的坐标为
,点
的坐标为
,以
为对角线作矩形
,使矩形的边与坐标轴垂直,并且点
在
轴上.
①直线
与矩形
的对角线互相平行或垂直时,求
的值;
②直接写出直线
与矩形的边
共有两个交点时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc992b23000cee65fb02ed99ef69d412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/a50e2306-cff9-4e13-aa66-e211733b0ef1.png?resizew=254)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c22487a4d5fe381c5e01b6b8772bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee4d89e8ecc56dc7b35d9cfbe306fe7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7268f97d924626f04197951f537215d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7268f97d924626f04197951f537215d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②直接写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb07c02aa49b36b480fa0e13879de215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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|
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(0.4)
名校
【推荐2】如图1,在平面直角坐标系中有一点
;将点A向左平移3个单位,再向下平移6个单位得到点B,直线
过点A、B,交x轴于点C,交y轴于点D,P是直线
上的一个动点,通过研究发现直线
上所有点的横坐标x与纵坐标y都是二元一次方程
的解.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/3bd298ac-c7f5-4b6f-bacc-6108264c7428.png?resizew=340)
(1)直接写出点B,C,D的坐标;
(2)求三角形AOB的面积;
(3)如图2,将D点向左平移
个单位
到E,连接CE,DG平分
交CE于点G,已知点F为x轴正半轴上一动点(不与C点重合),射线EF交直线AB交于点M,交直线DG于点N,试探究F点在运动过程中
、
、
之间是否有某种确定的数量关系,若存在,请写出对应关系式并证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f54dd475ff1321041c80738b201c3b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b360624d10f31d0b44ec86f06fa40d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/10/3bd298ac-c7f5-4b6f-bacc-6108264c7428.png?resizew=340)
(1)直接写出点B,C,D的坐标;
(2)求三角形AOB的面积;
(3)如图2,将D点向左平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e85369d9d0c472a1ecea5e86f440723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629a687148b89998209cb70bb1bd089a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7724af2445c723d1392aed54d210ed3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f6d79bc161f5e6b384c5497c369c01.png)
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【推荐1】对于平面直角坐标系xOy中的图形P,Q,给出如下定义:M为图形P上任意一点,N为图形Q上任意一点,如果M,N两点间的距离有最小值,那么称这个最小值为图形P,Q间的“非常距离”,记作
.已知点
,
,连接AB.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731874304/STEM/35c3d024-9fe0-45bd-bc26-c1ea2970a098.png?resizew=257)
(1)d(点O,AB)= ;
(2)⊙O半径为r,若
,直接写出r的取值范围;
(3)⊙O半径为r,若将点A绕点B逆时针旋转
,得到点
.
①当
时
,求出此时r的值;
②对于取定的r值,若存在两个α使
,直接写出r的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32286c3865f06865920816e7685c497a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdfc750fe0ace842a461e89f2b7b290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baca988e757625c577e02752422a72d.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731874304/STEM/35c3d024-9fe0-45bd-bc26-c1ea2970a098.png?resizew=257)
(1)d(点O,AB)= ;
(2)⊙O半径为r,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a335cd31742ea18cfd2a1d6722ecef5e.png)
(3)⊙O半径为r,若将点A绕点B逆时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd3900b1a2394b0b69d9ce5a6d01e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e553850a06ccbb33ca07515ddd21eb57.png)
②对于取定的r值,若存在两个α使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e553850a06ccbb33ca07515ddd21eb57.png)
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解答题-证明题
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较难
(0.4)
名校
【推荐2】如图,在等腰直角三角形
和
中,点
为它们的直角顶点,当
与
有重叠部分时:
(1)①连接
,如图1,求证:
;
②连接
,如图2,求证:
;
(2)当
与
无重叠部分时:连接
,如图3,当
,
时,计算四边形
面积的最大值,并说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926668799197184/1928046291353600/STEM/9ba08cd57a5d4f4fbfaf861736af8a8a.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926668799197184/1928046291353600/STEM/dcd6db1146f84304a9d55d87f427eaa4.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e88ee337b7c9082f4fe84fd1752d55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ca391ff42cf5266f447091ef2aec30.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e88ee337b7c9082f4fe84fd1752d55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926668799197184/1928046291353600/STEM/9ba08cd57a5d4f4fbfaf861736af8a8a.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926668799197184/1928046291353600/STEM/dcd6db1146f84304a9d55d87f427eaa4.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926668799197184/1928046291353600/STEM/6feed2aca20a4897929f9c25c0d59fe8.png?resizew=184)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】【感知探究】
如图①,已知
,点M在
上,点N在
上,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71c95914ac28138af38cb155ac4d940.png)
如图②,
的数量关系为(不需要证明)
如图③,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386cda9f96731510d52ec18199e18286.png)
如图④,已知
,
分别平分
和
,探究
之间的关系,并说明理由
如图①,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71c95914ac28138af38cb155ac4d940.png)
如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2dd2caab4fce5f13879e59c7f583fa.png)
如图③,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675d3e0e0011ee0dd2fe960fc81d5b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386cda9f96731510d52ec18199e18286.png)
如图④,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29aac7528869bd43cd59cb52f9b7c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20cb9e16756402c6fac159a0395a3f1.png)
您最近一年使用:0次
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较难
(0.4)
【推荐2】如图1,E是直线AB,CD内部一点,AB∥CD,连接EA,ED.
(1)探究猜想:①若∠A=30°,∠D=40°,则∠AED等于多少度?
②若∠A=20°,∠D=60°,则∠AED等于多少度?
③猜想图1中∠AED,∠EAB,∠EDC的关系并证明你的结论.
(2)拓展应用:如图2,线段FE与长方形ABCD的边AB交于点E,与边CD 交于点F.图2中①②分别是被线段FE隔开的2个区域(不含边界),P是位于以上两个区域内的一点,猜想∠PEB,∠PFC,∠EPF的关系(不要求说明理由).
(1)探究猜想:①若∠A=30°,∠D=40°,则∠AED等于多少度?
②若∠A=20°,∠D=60°,则∠AED等于多少度?
③猜想图1中∠AED,∠EAB,∠EDC的关系并证明你的结论.
(2)拓展应用:如图2,线段FE与长方形ABCD的边AB交于点E,与边CD 交于点F.图2中①②分别是被线段FE隔开的2个区域(不含边界),P是位于以上两个区域内的一点,猜想∠PEB,∠PFC,∠EPF的关系(不要求说明理由).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/4f0c222b-ee6b-4a8e-b7df-d839664a266a.png?resizew=323)
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【推荐3】感知发现:(1)在学习平行线中,兴趣小组发现了很多有趣的模型图,如图1,当
时,可以得到结论:
.那么如果把条件和结论互换一下是否还成立呢?于是兴趣小组想尝试证明:如图1,
,求证:
.请写出证明过程.
(2)利用这个“模型结论”,我们可以解决很多问题.在综合与实践课上,同学们以“一个含
角的直角三角尺和两条平行线”为背景开展数学活动,如图2.已知两直线a,b且
和直角三角形
,
,
,
.创新小组的同学发现
,说明理由.
实践探究:
(3)如图3,
,在射线
是
的平分线,在
的延长线上取点N,连接
,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6d9ef732deabacced5b48b2e32cf49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6d9ef732deabacced5b48b2e32cf49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)利用这个“模型结论”,我们可以解决很多问题.在综合与实践课上,同学们以“一个含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a4352562ae8aa968014fd0d931b677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87db26c93c31aa633abf8e57196c7a65.png)
实践探究:
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643e59176327bd52a66fbc507754b4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1923b4daa138346838c2c77489c5a766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4b59638c0838b664ff752a7c508814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2c42100dd2030e469a81d959a77b67.png)
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解题方法
【推荐1】已知,如图1,在
中,对角线
,
,
,如图2,点
从点
出发,沿
方向匀速运动,速度为
,过点
作
交
于点
;将
沿对角线
剪开,
从图1的位置与点
同时出发,沿射线
方向匀速运动,速度为
,当点
停止运动时,
也停止运动.设运动时间为
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/2020/5/15/2469690638852096/2472238316331008/STEM/9c0b0b06-ca60-4916-a5fa-6f7d8ec57180.png)
(1)当
为何值时,点
在线段
的垂直平分线上?
(2)设四边形
的面积为
,试确定
与
的函数关系式;
(3)当
为何值时,
有最大值?
(4)连接
,试求当
平分
时,四边形
与四边形
面积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28feec24e90329446e1af0ef53ab30d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fa79283e769e44399dab522aeaaf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fed79f92e159959c609b775300bef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b676dfde981c8baab99e65a6e1966c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f9a9781bcf32e907bdd3170261648a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3361be01aa6678bf00e0e08fe24ec61a.png)
![](https://img.xkw.com/dksih/QBM/2020/5/15/2469690638852096/2472238316331008/STEM/9c0b0b06-ca60-4916-a5fa-6f7d8ec57180.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf90d2a071b54a1b32384e1027722c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9382ec5c07f83ffd6df1fded6381dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cd8576a1aaed7e787af3f5b19822a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f8752f7eea7702a9b8b498f6fc41e7.png)
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解答题-作图题
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较难
(0.4)
【推荐2】直观感知和操作确认是发现几何学习的重要方式,解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/52875e2f-6b34-4c78-88b6-4b9f48589d47.png?resizew=277)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/19a4004c-0f63-4e5a-a975-4a1e71e80ed2.png?resizew=289)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/a62e7e36-8323-4c51-978f-e44a7651c728.png?resizew=296)
(1)问题情境:如图1,三个相同的三角尺拼成一个图形,直接写出图中的平行线;
(2)问题理解:如图2,在三个相同的直角三角形拼成的一个图形中,若点M是线段BC的三等分点(其中CM>BM),点P是线段AC上的一个动点,画出BP+PM取得最小值时点P的位置,并说明理由;
(3)问题运用:如图3,在三个相同的直角三角形拼成的一个图形中,点M是直线BD上的一个动点,点P是线段CE上的一个动点.若AC=a、CE=b、AE=c(其中a、b、c为常数),求DP+PM的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/52875e2f-6b34-4c78-88b6-4b9f48589d47.png?resizew=277)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/19a4004c-0f63-4e5a-a975-4a1e71e80ed2.png?resizew=289)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/a62e7e36-8323-4c51-978f-e44a7651c728.png?resizew=296)
(1)问题情境:如图1,三个相同的三角尺拼成一个图形,直接写出图中的平行线;
(2)问题理解:如图2,在三个相同的直角三角形拼成的一个图形中,若点M是线段BC的三等分点(其中CM>BM),点P是线段AC上的一个动点,画出BP+PM取得最小值时点P的位置,并说明理由;
(3)问题运用:如图3,在三个相同的直角三角形拼成的一个图形中,点M是直线BD上的一个动点,点P是线段CE上的一个动点.若AC=a、CE=b、AE=c(其中a、b、c为常数),求DP+PM的最小值.
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