如图,直线MN与x轴,y轴正半轴分别交于A,C两点,分别过A、C两点作x轴,y轴的垂线相交于B点,直线y=x与直线MN交于点P,已知AC=10,OA=8.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876742954442752/2883895448354816/STEM/f0f04c4c-57ea-4e4a-975c-f87a3d3f9965.png?resizew=387)
(1)求P点坐标;
(2)作
的平分线OQ交直线MN与点Q,点E、F分别为射线OQ、OA上的动点,连结AE与EF,试探索AE+EF是否存在最小值?若存在,请直接写出这个最小值;若不存在请说明理由;
(3)在直线MN上存在点G,使以点G,B,C三点为顶点的三角形是等腰三角形,请直接写出G点的坐标.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876742954442752/2883895448354816/STEM/f0f04c4c-57ea-4e4a-975c-f87a3d3f9965.png?resizew=387)
(1)求P点坐标;
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3a3bf63440a2fdd769162516fb0e1c.png)
(3)在直线MN上存在点G,使以点G,B,C三点为顶点的三角形是等腰三角形,请直接写出G点的坐标.
更新时间:2021-12-30 22:03:13
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【推荐1】已知点
是平面直角坐标系中第一象限的点,点
,
分别是
轴负半轴和
轴正半轴上的点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/97d80149-d684-4bcb-bc95-bd3d71eae98f.png?resizew=604)
(1)如图①,若
,
,且
,
,
在同一条直线上,求
的值;
(2)如图②,当
,
时,求
的值;
(3)如图③,点
、
、
在一条直线上,点
是
上一点,
.若
,直接写出
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133c51b42a92a0d193dbdd10654d608.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/97d80149-d684-4bcb-bc95-bd3d71eae98f.png?resizew=604)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9b5996067a3fc9adcf0ca178dddf03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350828c145496818e21daeebf4eee0a6.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/36a1b09c653185842513e24ebba60bb3.png)
(2)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25205a2e40047a73ba32b20088aee82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d3d3a435d0410eda0a5f1f10fd2292.png)
(3)如图③,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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb536d6ebc0fb831f9505cec8a83b68d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0187ed97f884caf0dae45662beb4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
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【推荐2】已知点
位于第三象限,点
位于第二象限,且
点是由点
向上平移
单位长度得到的.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/cd32a185-cb4a-4814-8075-1e2e5ad5ecfb.png?resizew=145)
(1)若点
的纵坐标为
,试求出
的值;
(2)在(1)题的条件下,试求出点
的坐标;
(3)若点
的横、纵坐标都是整数,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3039f5c49a5ae79a0b8ff3bdd050172c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cb03d6e1e21452b945e7308548087f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/cd32a185-cb4a-4814-8075-1e2e5ad5ecfb.png?resizew=145)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)在(1)题的条件下,试求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】某食品厂生产一种半成品食材,产量
百千克
与销售价格
元
千克
满足函数关系式
,从市场反馈的信息发现,该半成品食材的市场需求量
百千克
与销售价格
元
千克
满足一次函数关系,如下表:
已知按物价部门规定销售价格x不低于2元
千克且不高于10元
千克
求q与x的函数关系式;
当产量小于或等于市场需求量时,这种半成品食材能全部售出,求此时x的取值范围;
当产量大于市场需求量时,只能售出符合市场需求量的半成品食材,剩余的食材由于保质期短而只能废弃
若该半成品食材的成本是2元
千克.
求厂家获得的利润
百元
与销售价格x的函数关系式;
当厂家获得的利润
百元
随销售价格x的上涨而增加时,直接写出x的取值范围
利润
售价
成本
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e2627a30ca5d9deabd5014308980b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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销售价格 | 2 | 4 | 10 | |
市场需求量 | 12 | 10 | 4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
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【推荐2】如图,在平面直角坐标系中,
是等腰三角形,
,
轴,点A的坐标为
,点C的坐标为
,直线
与
轴交于点
,
与
轴交于点D.
(1)求点B的坐标;
(2)动点P从点A出发,沿折线
方向以1个单位长度/秒的速度向终点C匀速运动,设
的面积为
,点P的运动时间为t秒,求S与t之间的函数关系式;
(3)在(2)的条件下,当P在线段AB上运动时,求t为何值时,△BPE为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fe75f967e8915c9124a5d4ac420a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cceff0e7d103475c3ba9a2712f373185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2f59980057f51e5cf3e86038cfaa16.png)
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![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/4e76729c-30a5-4c1a-918c-89cf8e7162d6.png?resizew=214)
(1)求点B的坐标;
(2)动点P从点A出发,沿折线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba8a7ce19548adba34a16080230360d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcec4ac7e09eb8b0e342f4f74f7feb65.png)
(3)在(2)的条件下,当P在线段AB上运动时,求t为何值时,△BPE为等腰三角形.
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【推荐1】如图,在平面直角坐标系中,已知直线
交y轴于点A,交x轴于点B,点
(0,
),直线DE为AB的中垂线,垂足为点E,交x轴于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/6f1660dc-eb87-46f8-b67a-30ef84f43d2c.png?resizew=505)
(1)如图1,点E的坐标为______,直线DC的表达式为______;
(2)如图1,若点M为直线CD上一个动点,且点M在第一象限,过点M作
轴,交直线AB于点N,当四边形AMND为菱形时,求点M的坐标;
(3)如图2,点P为x轴上的一个动点,连接PA,PD,将△ADP沿DP翻折得到
,当
时,点P的坐标为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f498fe4cd876695ab6512729ecba7f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32db5b9f56b2ae4ea67ec4d5f6e63626.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/6f1660dc-eb87-46f8-b67a-30ef84f43d2c.png?resizew=505)
(1)如图1,点E的坐标为______,直线DC的表达式为______;
(2)如图1,若点M为直线CD上一个动点,且点M在第一象限,过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20f734ac54ab0eec2e1c170a3a24f1.png)
(3)如图2,点P为x轴上的一个动点,连接PA,PD,将△ADP沿DP翻折得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae97de31d8aa165c21d4e4a4f3a9e4a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedc3e5bdb344899ecadbcec54676d1b.png)
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【推荐2】已知,函数y=
x与函数y=
相交于点M,N(其中M在N的左侧),点P是函数y=
x图象上一点,且点P在点N右侧,PA⊥x轴于点A,交函数y=
图象于点E,PB⊥y轴于点B,交函数y=
图象于点F(点E,F不重合).
(1)求线段MN的长度;
(2)判断:EF与AB的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
(1)求线段MN的长度;
(2)判断:EF与AB的关系,并说明理由.
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【推荐3】如图,在菱形
中,
,
.动点
从点
出发,沿折线
以每秒1个单位长度的速度向点
运动;点
出发2秒后,动点
从点
出发,沿折线
向点
运动,在
上的速度为1个单位长度
秒,在
上的速度为2个单位长度
秒.过
、
两点分别作
的平行线,这两条平行线在菱形上截出的阴影部分图形记作
.点
运动的时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/68869eb3-0827-4941-8e12-fc0ceac35d17.png?resizew=423)
(1)直接写出
的长为______.
(2)当
时,G的面积是多少?
(3)设G的周长为y,当
时,求y与t之间的函数关系式.
(4)若去掉G以后,剩余的两部分图形可以拼成一个轴对称四边形,直接写出t值.
![](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/c5b8b98b2f83279a49e94d9f48c5e6f2.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/778cdfe7346279f9695a745fb780e806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778cdfe7346279f9695a745fb780e806.png)
![](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/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/68869eb3-0827-4941-8e12-fc0ceac35d17.png?resizew=423)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
(3)设G的周长为y,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18dccba7bc301e4913b1a4856afae466.png)
(4)若去掉G以后,剩余的两部分图形可以拼成一个轴对称四边形,直接写出t值.
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解答题-问答题
|
较难
(0.4)
【推荐1】在
中,
为
边上一动点(点
与点
不重合),联结
.过点
作
交边
于点
.
(1)如图,当
时,求
的长;
(2)设
,求
关于
的函数解析式并写出函数定义域;
(3)把
沿直线
翻折得
,联结
,线段
与射线
交于点
,当
是等腰三角形时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e052a22921698acaae1f2f64d4bc44e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a32884afd5c49777628d70827a9d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/07b8833f-a1d8-4368-8788-a56736e86879.png?resizew=358)
(1)如图,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c22eb62f36ff06a8cf5a17ba19a10c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d04aec2dfd4e2db4e0a846e5cd77db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ada91813a8e1bcdaf60db6d10a0650f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffb952f86442845da723fd291564484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbbd875a377facfe4b9abc936a8829a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】【阅读材料】小明同学发现这样一个规律:两个顶角相等的等腰三角形,
如果具有公共的顶角的顶点,并把它们的底角顶点连接起来则形成一组全等的三角形,小明把具有这个规律的图形称为“手拉手”图形.如图1,在“手拉手”图形中,小明发现若
,
,
,则
≌
.
【材料理解】(1)在图1中证明小明的发现.
【深入探究】(2)如图2,
和
是等边三角形,连接BD,EC交于点O,连接AO,求
的度数?
【延伸应用】(3)如图3,
,
,试探究
与
的数量关系.
如果具有公共的顶角的顶点,并把它们的底角顶点连接起来则形成一组全等的三角形,小明把具有这个规律的图形称为“手拉手”图形.如图1,在“手拉手”图形中,小明发现若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
【材料理解】(1)在图1中证明小明的发现.
【深入探究】(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
【延伸应用】(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a18d6c52c73deaf2e3cb979a9a1f03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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