1 . 【问题探究】
数学实践小组的同学利用一张宽
的矩形纸片
进行了如下的操作写探究:
第一步:如图1,将该矩形纸片
沿过点D的直线折叠,使点A落在
上的点
处,得到折痕
,然后把纸片展平.
第二步:如图2,将图1中的矩形纸片
沿过点E的直线折叠,使点C恰好落在
上的点
处,点B落在点
处,得到折痕
,
交
于点M,
交
于点N,再把纸片展平.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/92461c98-e5a3-4bb9-8ad0-0ddff2fd50b9.png?resizew=541)
(1)【问题解决】
如图1,填空:四边形
的形状是__________.
(2)如图2,小明连接了
,E两点,发现线段
写
是相等的.
①请帮助小明写出证明过程;
②如图2,若
,求
的值.
(3)【问题延伸】如图3,若该矩形纸片的长
,点Q在
边上,且
,P是
边上的动点(不与点A,B重合).现将纸片沿
折叠,使点B,C分别落在点
,
处.在点P从点A向点B运动的过程中,若边
与边
交于点E,则点E相应运动的路径长为__________
.
数学实践小组的同学利用一张宽
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ba841469751fbbe3bb32d8104e7ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
第一步:如图1,将该矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
第二步:如图2,将图1中的矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae72f1da4f5d540dc1e6f42ea08f952e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/92461c98-e5a3-4bb9-8ad0-0ddff2fd50b9.png?resizew=541)
(1)【问题解决】
如图1,填空:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0054610b07c11f3cb88aa87b58c2df11.png)
(2)如图2,小明连接了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199336204fbca97766bf24b1dc5fdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
①请帮助小明写出证明过程;
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7cc093590932b50a1081b3a13e38c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fd706e7e0d3f4fd3230bfb8eef4eb5.png)
(3)【问题延伸】如图3,若该矩形纸片的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7461c64408e4aae4e73d0884182403b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1945413088e2b64eaa2282f74cd7fa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e346ac3950f60077291dda2be73c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af089fd292ba69ddef79e9ab1cac77ca.png)
您最近一年使用:0次
2022-06-23更新
|
248次组卷
|
2卷引用:贵州省安顺市2021-2022学年九年级下学期4月月考数学试题
2 . 如图,在菱形ABCD中,对角线AC,BD相交于点O,且
,
,点M从点B出发,沿着BA方向匀速运动,速度为1cm/s;同时,直线PQ从点D出发,沿着DB方向匀速移动,速度为1cm/s.PQ
AC且分别与AD、BD、DC交于点P、N、Q;当直线PQ停止移动时,点M也停止运动,连接MQ,设运动时间为t(s)(
),请解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992583942144000/2996123501281280/STEM/61dfefd86ea841838a36bd3dd19b7ac2.png?resizew=478)
(1)用含t的代数式表示DQ.
(2)t为何值时,四边形AMQD是平行四边形?
(3)是否存在t,使得四边形AMQP面积最大?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1337ce85d29edabcc2fadb9a9cc31ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0fed6f944ef4b07f7e33ca893581fa.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992583942144000/2996123501281280/STEM/61dfefd86ea841838a36bd3dd19b7ac2.png?resizew=478)
(1)用含t的代数式表示DQ.
(2)t为何值时,四边形AMQD是平行四边形?
(3)是否存在t,使得四边形AMQP面积最大?若存在,求出t的值;若不存在,请说明理由.
您最近一年使用:0次
3 . 如图,在正方形ABCD中,点E是边BC的中点,连接AE、DE,分别交BD、AC于点P、Q,过点P作
交CB的延长线于F.下列结论:①
;②
;③
;④若四边形OPEQ的面积为4,则该正方形ABCD的面积为36;⑤
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992746116136960/2994664549908480/STEM/53359fd6-ca49-4722-a0da-b0fb2f704f67.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c66902c5f7d00de2e4ba9ccfcfd759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6196604433130cca2b7271e35d48f260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d383113c73c10c13c88a22df2f31a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3e9fc260122d04a1b0df2cd0ce606b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c9aaaab6c4fe9d525278ad6e67570c.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992746116136960/2994664549908480/STEM/53359fd6-ca49-4722-a0da-b0fb2f704f67.png?resizew=163)
A.①②③④ | B.①③④⑤ | C.①②④⑤ | D.①②③⑤ |
您最近一年使用:0次
4 . 已知抛物线
与x轴交于点
,
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661428174848/STEM/66800771-ff0e-44c0-bc9b-1da856c411d1.png?resizew=372)
(1)求抛物线的函数解析式.
(2)如图1,点D在抛物线上,过点D作
轴,交直线BC于点E,交x轴于点F,设点D的横坐标为m,且
,求线段DE长度的最大值.
(3)如图2,设M为抛物线的顶点,
,在y轴上是否存在点Q,使得
?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661428174848/STEM/66800771-ff0e-44c0-bc9b-1da856c411d1.png?resizew=372)
(1)求抛物线的函数解析式.
(2)如图1,点D在抛物线上,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010989c488d7f0551c9f2aa8bba6bf1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1464ddc459a7d19e2ff4e322c171e123.png)
(3)如图2,设M为抛物线的顶点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecab76dc432d7571230ae427262c222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caeeab8917ab89f1379d9b846653b463.png)
您最近一年使用:0次
5 . 如图,在△ABC中BC<AC,∠A+∠C=60°,点D在BC上,点E在AC上,连接DE,∠ABC=∠DEC,过点B作BF⊥AC于点F.若DB=AB,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae9da6f83c6fd6b062893b2a86755aa.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
A.1 | B.2 | C.![]() | D.![]() |
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6 . 如图,在Rt△ABC中,∠ABC=90°,以BC边的中点O为圆心,
BC为半径作圆,点D是⊙O上一动点,点E是弦CD的中点,连接AE,若BC=4,AB=3,则AE+
BE的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985697865170944/2991237720801280/STEM/de15e49b-861b-48a2-8f58-273517f19eba.png?resizew=242)
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7 . 如图,已知二次函数
的图象经过点
且与x轴交于原点及点
,顶点为A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/e79b0960-d952-4ccc-8208-196777cdd8f1.png?resizew=166)
(1)求二次函数的表达式;
(2)判断
的形状,试说明理由;
(3)若点P为
上的动点,且
的半径为
,一动点E从点A出发,以每秒2个单位长度的速度沿线段
匀速运动到点P,再以每秒1个单位长度的速度沿线段
匀速运动到点B后停止运动,求点E的运动时间t的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ae77c8c436232bb6f0ddd2b95d968c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c95911ef9acebacd76928e930bf37d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd58ef950ddec3eb3ebf8e64f6228ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/e79b0960-d952-4ccc-8208-196777cdd8f1.png?resizew=166)
(1)求二次函数的表达式;
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
(3)若点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4fdb5584c8adfe3e2ce8670753c3846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
您最近一年使用:0次
8 . 某校数学兴趣学习小组在一次活动中,对一些特殊几何图形具有的性质进行了如下探究:
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
中,
,点
是边
上任意一点,连接
,以
为腰作等腰
,使
,∠MAN=∠BAC,连接
.求证:
.
(2)类比探究:如图2,在等腰
中,
,
,
,点
是边
上任意一点,以
为腰作等腰
,使
,
.在点
运动过程中,
是否存在最小值?若存在,求出最小值,若不存在,请说明理由.
(3)拓展应用:如图3,在正方形
中,点
是边
上一点,以
为边作正方形
,
是正方形
的中心,连接
.若正方形
的边长为6,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0eef65b7d4459a21b2e8a04b26f58e6.png)
(2)类比探究:如图2,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3120ed27a38e603da96b23aab70dfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)拓展应用:如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5693553cd6992eda2b827fd73fb73766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
您最近一年使用:0次
2022-05-29更新
|
286次组卷
|
2卷引用:2022年贵州省遵义市新蒲新区初中生毕业认定测试(三模)数学试卷
9 . 数学实践活动,是一种非常有效的学习方式.通过活动可以激发我们学习兴趣,提高动手动脑能力,拓展思维空间,丰富数学体验.让我们一起动手来折一折、转一转、剪一剪,体会活动带来我们的乐趣.
折一折:将正方形纸片
折叠,发现
、
都落在对角线
上,展开得折痕
、
,连接
,如图1
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/4898928116df49668fe624691fba74b3.png?resizew=131)
(1)
______°,写出图中两个等腰三角形:_____(不需要添加字母);
(2)转一转:将图1中
绕点A旋转,使它的两边分别交边
、
于点
、
,连接
,如图2,线段
、
、
之间的数量关系为______;
(3)连接正方形对角线
,如图2中的
的边
、
分别交对角线
于点
、点
,如图3,则
______;
(4)剪一剪:将图3中的正方形纸片沿对角线
剪开,如图4.求证:
.
折一折:将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/0e3b1549bdd34903ba634bd7d6a487b6.png?resizew=387)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/4898928116df49668fe624691fba74b3.png?resizew=131)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
(2)转一转:将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(3)连接正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/94874d85399fc67d9d86bbb89acadeca.png)
(4)剪一剪:将图3中的正方形纸片沿对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc386f4abe6ec5082f9507c91ddc16d.png)
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10 . 小杰同学在中考总复习时,遇到一个课本上的问题,温故知识后进行了操作推理与拓展应用.
(1)温故知识:如图①,在
中,一个正方形
的边
在
上,顶点P,N分别在
,
上,作
于点D,交
于点E,若
,
.求正方形
的边长;(用含a,h的代数式表示)
(2)操作推理:如何画出这个正方形
呢?
如图②,小杰画出了图①的
,然后又进行以下操作:先在
边上任取一点
,画正方形
,使点
,
在
边上,点
在
内,然后连接
,并延长交
于点N,作
于点M,
交
于点P,
于点Q,得到四边形
.证明:图②中的四边形
是正方形;
(3)拓展应用:在(2)的基础上,在线段
上截取
,连接
,
(如图③),当
时,请直接写出线段
的长.(用含a,h的代数式表示)
(1)温故知识:如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d22f065ec04de109d913e8e7855110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(2)操作推理:如何画出这个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
如图②,小杰画出了图①的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca9581c221aa3016b035444015a7e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d486055c508b9ff7f79fb8d2a464458b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dacd0086635538bf42d08bfdaf481cb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e2c2bfe8c8337ca8f2fba6af5fddec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(3)拓展应用:在(2)的基础上,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df7c43dd51ecde238a068b8138e8b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e33bc76f589215d9738bfc3988bfdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2972987740037120/2979393519583232/STEM/a1756d1a-bd5b-4850-b603-4d3b2878a69f.png?resizew=570)
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