如图1,点E在
上,点F在
上,点M在直线
之间,且
,
;
(2)如图2所示,点M、N在
之间,且位于
的异侧,连
,若
,则
,
,
三个角之间存在何种数量关系,并说明理由.
(3)如图3,连接
,
;
,且
平分
.若
,
与
的三等分线交于N,则
__________(用含
的式子表示).
![](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/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bf3ac4b31c4892ca775047ed6c1e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)如图2所示,点M、N在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8568240aadfe46277f0cde14ac83c634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b59874dae8b394a4e434aa3875708a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05cbf5c2be437d5794e83deca8a53e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bfa0bbe05b01453e6ed15d74da2602.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982f824aa56c399260dcf6e83d169344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44faf78bfa94c0a54b98b418cafeed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572eff69e7d466a942ee653bbb1536d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6e4330927acd53f2006bb60b6a1be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd00540dba9c02cf78f01abd08db7cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
更新时间:2023-06-14 21:25:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】直线
,点
、
分别是直线
、
上的点,点
为直线
、
之间的点.
、
、
之间的数量关系,并说明理由.
(2)如图2,点
为直线
上一点,且点
在点
右侧,
,
的平分线交直线
于点
,点
在点
右侧,求
的值.
(3)如图3,
绕点
转动,
与
交于点
,且
始终在
的内部,
平分
,交直线
于点
,
平分
,交直线
于点
,若
,
,则
(用含
、
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6500fbe1ea4a372d703502699b809e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e01a50068668eddfb72b8b24b3f167f.png)
(2)如图2,点
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40ad1159f1ee9fc73f7d53d710447af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff3ad05695a29e9d60b6523f1afe545.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83959d666bac35b6797b7ec65e2d9549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83959d666bac35b6797b7ec65e2d9549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30424d4a6acc123c4e5be68f1558fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58369425f09cff783b446dcca14c520f.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/81d7c12df32faefaae0d156a1b167d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6858c6b3324d8ac6dde4a6cb9cd44efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b729e28edcf6e9a10abc6a3b42f57d8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】感知与填空:如图①,直线
,求证:
.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377869176381440/2378853354201088/STEM/59d3fe28-79ca-4efb-92bb-2d7627e72e89.png?resizew=190)
阅读下面的解答过程,并填上适当的理由,
解:过点
作直线
,
( )
(已知),
,
( )
( )
,
( )
应用与拓展:如图②,直线
,若
.
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377869176381440/2378853354201088/STEM/a905d9c3-b3d2-4057-a04b-c45201ebda36.png?resizew=240)
则
度
方法与实践:如图③,直线
,若
,则
度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e084585eb508bad9e22ce25cc68ea9ec.png)
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377869176381440/2378853354201088/STEM/59d3fe28-79ca-4efb-92bb-2d7627e72e89.png?resizew=190)
阅读下面的解答过程,并填上适当的理由,
解:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451557ef624a9c142ebc5fa155e0e28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0b06e055d888b37023cb37cd18044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c1e93108acf1f678cc26c0d9959eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451557ef624a9c142ebc5fa155e0e28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfdc024e46f8250072b82918bd1c234c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a772b41de6cab4c2acca5bf9b865833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f133889118bc3a3ee7fd04089dfea36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596c62b62bdec54e9f3ec91cf5bad4d2.png)
应用与拓展:如图②,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f686a22dd4787bc0a1f980d7fa3dd00c.png)
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377869176381440/2378853354201088/STEM/a905d9c3-b3d2-4057-a04b-c45201ebda36.png?resizew=240)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd22ae91fec3089dd265deed010187.png)
方法与实践:如图③,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7028a6887de12ded1ea05c95e3c4defb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7960538cb70fcf641b94864a90190d.png)
![](https://img.xkw.com/dksih/QBM/2020/1/15/2377869176381440/2378853354201088/STEM/00d72b86-bdc4-4bbf-906e-74f1a846f468.png?resizew=206)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
名校
【推荐1】【尝试应用】
小明将两副大小不同的三角板如图所示放置,
和
为等腰直角三角形,
,连接
,
,直线
经过点B交
于M,交
于N.
(1)如图1,若
,请直接写出
与
的数量关系;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/7851431a-b798-4644-a848-567ff8db435c.png?resizew=162)
【类比迁移】
(2)如图2,若点M是
的中点,请判断
与
的位置关系和数量关系,并证明;(小明发现:延长线段
至点F,使得
,连接
,证明了
与
的关系,便可解决问题)请你按照他的思路,完成证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/01e952dc-7724-4292-8c7c-a5fa699dc7e1.png?resizew=162)
【拓展应用】
(3)如图3,小明又找了两副大小相同的直角三角板,且
,
,连接
,
,直线
经过点B交
于M,交
于N,若点M是
的中点.求:
①
;
②
.
小明将两副大小不同的三角板如图所示放置,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ae31b70c84b0c8bf215843182a8c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6205d57a84ea84d2211c2241ba299f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/7851431a-b798-4644-a848-567ff8db435c.png?resizew=162)
【类比迁移】
(2)如图2,若点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318d65293a090a9c5725882e856bd5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/01e952dc-7724-4292-8c7c-a5fa699dc7e1.png?resizew=162)
【拓展应用】
(3)如图3,小明又找了两副大小相同的直角三角板,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c1b5e1f90cd17148f489e28ce1bc48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ae31b70c84b0c8bf215843182a8c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8211d7f3a899c489334b4def6012108.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c4740bef220606b2e4e4fee048529a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/cf616e5b-6f67-4cf1-9dd5-f3a6a0034827.png?resizew=188)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】综合与实践:
在一次数学活动课上,老师带领学生对矩形纸片进行如下操作:
![](https://img.xkw.com/dksih/QBM/2023/9/2/3315876055195648/3325234313355264/STEM/cda2548ff8684c5db1c3248310a780da.png?resizew=550)
(1)探究一:
如图1,矩形纸片
中,
.如图2,点P在
上,点Q在
上,
,将纸片沿
翻折,使顶点C落在矩形
内,对应点为
的延长线交直线
于点M,再将纸片的另一部分翻折,使顶点A落在直线
上,对应点为
,折痕为
.猜想
,
之间的位置关系为:
(2)探究二:
如图3,将纸片任意翻折,折痕
(P在
上,Q在
上),使顶点C落在矩形
内,对应点为
的延长线交直线
于点M,再将纸片的另一部分翻折,使顶点A落在直线
上,对应点为
,折痕为
.猜想
,
之间的位置关系,并给出证明.
(3)探究三:
如图4,若
,
,
,当P为
的三等分点时,直接写出
的值.
在一次数学活动课上,老师带领学生对矩形纸片进行如下操作:
![](https://img.xkw.com/dksih/QBM/2023/9/2/3315876055195648/3325234313355264/STEM/cda2548ff8684c5db1c3248310a780da.png?resizew=550)
(1)探究一:
如图1,矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.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/055c583a7ddf04e766727cb9bb2fc09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a30c4df0ff2da41ce8431b13c9936832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7096fdcee49451970e84214dee5c2e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)探究二:
如图3,将纸片任意翻折,折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a30c4df0ff2da41ce8431b13c9936832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7096fdcee49451970e84214dee5c2e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)探究三:
如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb4252bbeacacd8b21432c083a28021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30e51d3170d01d7c227b71902e25626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83847bf2e9122ea6a025efd87bd535f5.png)
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解题方法
【推荐3】已知:三角形ABC和三角形DEF位于直线MN的两侧中,直线MN经过点C,且
,其中
,
,
,点E、F均落在直线MN上.
;聪明的小丽过点C作
,并利用这条辅助线解决了问题.请你根据小丽的思考,写出解决这一问题的过程.
(2)将三角形DEF沿着NM的方向平移,如图2,求证:
;
(3)将三角形DEF沿着NM的方向平移,使得点E移动到点
,画出平移后的三角形DEF,并回答问题,若
,则
________.(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67662c47e2dfa08001a62fa17320f477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77c8ef75793d21d2d5d8bf470a61159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b9e3796da60196edb475284ecbc394d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7265bdd1d63699f59203f0c4e188d9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59239d2d861274c15d23a8834e9db6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c230c6c6b56e160ef8bbf03bf8bb46da.png)
(2)将三角形DEF沿着NM的方向平移,如图2,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1912c4e0fe478ba402a887fdc759d3f1.png)
(3)将三角形DEF沿着NM的方向平移,使得点E移动到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32490737e4717987bfa3e2f216e575b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425096d3331bba2ff665a9111a6727f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033968c7f033a066499e75696a7bae5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐1】【问题原型】如图①,
,点M在直线AB、CD之间,请说明
,
【问题迁移】如图②,
,点M与直线CD分别在AB的两侧,请写出
、
、
之间有怎样的数量关系,不需要证明.
【推广应用】
(1)如图③,
,点M在直线AB、CD之间,
的平分线与
的平分线交于点N,
,则
______°;
(2)如图④,
,点M与直线CD分别在AB的两侧,
的平分线与
的平分线交于点N,
,则
______°;
(3)如图⑤,
,
的平分线与
的平分线交于点M,
,
,
,则
______°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b3e5106bf9027ad4851ef85926eca.png)
【问题迁移】如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a742abf1b0702125a0c77cbfbef118ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/ee837bec-b510-4e59-b907-7b1854050aec.png?resizew=309)
【推广应用】
(1)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574b30568945d352be0b8a8aac2d857f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b221038a34a84ad6354d942647f1ecc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd00540dba9c02cf78f01abd08db7cd9.png)
(2)如图④,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574b30568945d352be0b8a8aac2d857f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c255a91302586cd2cd0011f94cee5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15828203e298808eaca513f0dde52096.png)
(3)如图⑤,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af342d3b871ace448ccc7c648528288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a777afbd65442fa3c47dbf5ca8104431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4703df03ce71208172e8685b1bb69954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49de8d04df8f165ee7efe04af6294b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15828203e298808eaca513f0dde52096.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/763f9298-143d-4bcf-a094-94e61c458164.png?resizew=409)
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【推荐2】如图1,大运河某河段的两岸
、
安置了两座可旋转探照灯M、N假设河道两岸平行(即
),灯M光从
开始顺时针旋转至
便立即回转,灯N光束从
开始顺时针旋转至
便立即回转,两灯不停照射巡逻.灯M转动的速度是每秒1度,灯N转动的速度是每秒2度,灯M转动的时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/9277d75b-48bb-4c5e-8beb-e481cc56b8f7.png?resizew=460)
(1)若灯M光束先转动30秒后,灯N光束才开始转动.
①直接写出灯M光束和灯N光束,灯 先回转;(填M或N)
②在灯M光束到达
之前,当两灯的光束平行时,求t的值;
(2)如图2,连接
,且
.
①直接写出
= ;
②若两灯同时转动,在灯N到达
之前,若两灯光束交于点E,在转动过程中,请探究
与
的之间数量关系?并说明理由.
![](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/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/9277d75b-48bb-4c5e-8beb-e481cc56b8f7.png?resizew=460)
(1)若灯M光束先转动30秒后,灯N光束才开始转动.
①直接写出灯M光束和灯N光束,灯 先回转;(填M或N)
②在灯M光束到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50db7783974fcc7535318fe598867b97.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18104b46692bd03c473fa81c38e49ca4.png)
②若两灯同时转动,在灯N到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502b2e185cf1eede6730577e6924e486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4410f982bf334fa726c417ee1d6554.png)
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【推荐1】(1)如图,设
,
,
,求证:
;
(2)若把(1)的题设中的“
”与结论中的“
”对调后,命题还成立吗?说明理由;
(3)若把(1)的题设中的“
”与结论中的“
”对调后,命题还成立吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
(2)若把(1)的题设中的“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
(3)若把(1)的题设中的“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://img.xkw.com/dksih/QBM/2020/5/3/2454634994982912/2454780093661184/STEM/0a3b3925834b431db67a7509be48cb93.png?resizew=268)
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名校
【推荐2】公元3世纪初,我国数学家赵爽证明勾股定理的图形称为“弦图”.1876年美国总统Garfeild用图1(点
、点
、点
三点共线)进行了勾股定理的证明.
与
是一样的直角三角板,两直角边长为
,
,斜边是
.
请用此图1证明勾股定理.
的边
和边
为边长分别向外作正方形
和正方形
,过点
分别作
的垂线段
,那么
的数量关系是怎样?说明理由.
扩展应用2:如图3,在两平行线
之间有一正方形
,已知点
和点
分别在直
上,过点
作直线
,已知
之间距离为
,
之间距离为2.直接出正方形的面积是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc7cfd8b712d5bd64c435578ec671000.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)
请用此图1证明勾股定理.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1b3daff578c575aa92e89573a8c757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5842cd648ff2c62e66b2dd1c1ee3863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8854d5bb4080ae602dc681e7de3dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7db6635d4fb09d76a17c7a6d58f9972.png)
扩展应用2:如图3,在两平行线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0877194ab8760f54c35527177b03ff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0877194ab8760f54c35527177b03ff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773a2d6e6054d3f518f6e5c80ea3e0f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0886915c8a8e79737bc6bb4d4256b40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0886915c8a8e79737bc6bb4d4256b40f.png)
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