1 . 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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2 . (1)【问题发现】
如图1,在
中,
,
.将
绕点B顺时针方向旋转90°,点A的对应点为点E,连接AE,则
______.
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934605068271616/2936310282592256/STEM/26719285-1f1c-419d-b169-a80b2b70cf13.png?resizew=139)
(2)【问题解决】
如图2,在
中,
,
,
,延长CB到M,使
,将斜边AB绕点B顺时针旋转90°到BE,连接CE,ME.求ME的长.
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934605068271616/2936310282592256/STEM/f5875ce3-85f3-41a6-aefb-7bc98e128a58.png?resizew=215)
(3)【拓展延伸】
如图3,在四边形ABDF中,
,垂足为C,
,
,
,
,请用含k的式子表示AD的长.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934605068271616/2936310282592256/STEM/26719285-1f1c-419d-b169-a80b2b70cf13.png?resizew=139)
(2)【问题解决】
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/726a716fcd2557b553b16ea9305e4282.png)
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934605068271616/2936310282592256/STEM/f5875ce3-85f3-41a6-aefb-7bc98e128a58.png?resizew=215)
(3)【拓展延伸】
如图3,在四边形ABDF中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31025539da369c563e8633f375146593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a063938857a5cfdfab57144845c9d242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fdddadc89dc7ffbc92ceb4b49121f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b22a9e80e0e2829d10fe3d6cbf972f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934605068271616/2936310282592256/STEM/dd72b118-3c11-481d-8fdc-037dfea1ca3f.png?resizew=207)
您最近一年使用:0次
2022-03-14更新
|
175次组卷
|
2卷引用:2023年贵州省黔西南州兴义市顶效开发区顶兴学校九年级下学期学业水平(押题二)数学模拟预测题
3 . 在
中,
,点
在线段
上,
,
交
于点
,过点
作
,垂足为
,交
的延长线于点
.
(1)如果
,如图①,当点
与点
重合时,求证:
;
(2)在(1)的条件下,当点
在线段
上,且不与点
,
重合时,如图②,小明想要求证
,他发现过点
作
交
于点
,交
于点
后,就可以借助第(1)题的结论来解决此题,请你按照他的思路完成证明过程;
(3)如果
,如图③,已知
(
为正数),当点
在线段
上,且不与点
,
重合时,请探究
的值(用含
的式子表示),并写出你的探究过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93572e4ae3065931d938a9de3e5cda44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/95a5be65-929b-4c71-b437-c8635f10caff.png?resizew=467)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce01d5169ec4497a45c799cd33c94c8.png)
(2)在(1)的条件下,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/6f935a74588bfbbb7f73323ba3e19a0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d82413bb7d0bdbca363f67d685b4652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ee042fe1ab4e7b97b9b9b935e367a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424c10c9363175014ee86ea881331272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/bfeb1696290ff2810cca701bd6f02c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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4 . 如图1,矩形
的一条边
,将矩形
折叠,使得顶点
落在
边上的
点处,已知折痕与边
交于点
,连接
、
、
.
(2)如图2,擦去折痕
、线段
,连接
.动点
在线段
上(点
与点
、
不重合),动点
在线段
的延长线上,且
,连接
交
于点
,作
于点
.探究:当点
、
在移动过程中,线段
与线段
有何数量关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69a485cbd0db39582d6b3b586ace216.png)
(2)如图2,擦去折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49e6705a9c402a379f190f7afdefddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee254d4595168ce114a2a1ebb26383e3.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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5 . 某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
中,
,
分别是
、
上两点,连接
,
,若
,求证:
.
(2)如图2,在矩形
中,过点
作
交
于点
,若
,求
的值.
(3)如图3,在四边形
中,
,
为
上一点,连接
,过点C作
的垂线交
的延长线于点
,交
的延长线于
,且
,
,
,求
的长.
![](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/a0ed1ec316bc54c37c4286c208f55667.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d4a94e65672e52bac3e6c927b0a66d1.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968f5fd009e1d4c430529e24f8c92b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5aa8272ce6c48ea254acaa1d2abd767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
2024-04-30更新
|
149次组卷
|
2卷引用:2024年贵州省黔西南州部分学校中考数学一模模拟试题
名校
解题方法
6 . (1)问题
如图1,在四边形
中,点P为
上一点,当
时,求证:
.
(2)探究
若将
角改为锐角(如图2),其他条件不变,上述结论还成立吗?说明理由.
(3)应用
如图3,在
中,
,
,以点A为直角顶点作等腰
.点D在
上,点E在
上,点F在
上,且
,若
,求
的长.
如图1,在四边形
![](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/7502d2b89b731a7c11faa97815d46d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c4bc1c164e8dd6747cf998b237ef90.png)
(2)探究
若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(3)应用
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02a4bbef957f179f55c28b37c64ce37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4307209e1e5cad88fc1b8163858688ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/b1005612-29bc-4caf-9915-c0cc0f88f83a.png?resizew=484)
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2023-02-28更新
|
945次组卷
|
20卷引用:贵州省毕节市织金县2023-2024学年九年级上学期期末数学试题
贵州省毕节市织金县2023-2024学年九年级上学期期末数学试题山东省济南市济阳区2021-2022学年九年级上学期期中考试数学试题2022年山东省泰安市岱岳区中考三模数学试题2022年山东省菏泽市中考第三次模拟考试数学试题2022年山东省菏泽市牡丹区九年级中考三模数学试题四川省内江市隆昌市第一中学2022-2023学年九年级上学期第三次月考数学试题山东省济南市平阴县2022-2023学年九年级上学期期末数学试题(已下线)第14讲 相似三角形中的“一线三等角”模型-【多题一解&一题多解】冲刺2023年中考数学满分应对方法与策略(全国通用)山东省泰安市东平县2022-2023学年八年级下学期期末数学试题广东省深圳市南山区哈尔滨工业大学(深圳)实验学校2023-2024学年九年级上学期期中数学试题安徽省合肥市2023-2024学年九年级上学期期中模拟数学试题安徽省宿州市萧县2023-2024学年九年级上学期期中数学试题河南省南阳市唐河县2023-2024学年九年级上学期期中数学试题广东省佛山市南海外国语学校2023-2024学年九年级上学期第三次月考数学试题(已下线)清单18 相似三角形的10大经典模型-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)山东省济南市历城区2023-2024学年九年级上学期期末数学试题浙江省宁波市2023-2024学年九年级上学期期末考试数学试题广东省河源市和平县2023-2024学年九年级上学期期末数学试题四川省遂宁市蓬溪县蓬溪中学校2023-2024学年九年级上学期期中数学试题四川省内江市隆昌市知行中学2023-2024学年九年级上学期第三次月月考数学试题
7 . 如图,抛物线
(
、
为常数)与
轴交于
、
两点,与
轴交于
点,直线
的函数关系式为
.
点坐标;
(2)已知点
是线段
上的一个动点,过点
作
轴的垂线
分别与直线
和抛物线交于
、
两点,当
为何值时,
恰好是以
为底边的等腰三角形?
(3)在(2)问条件下,当
恰好是以
为底边的等腰三角形时,动点
相应位置记为点
,将
绕原点
顺时针旋转得到
(旋转角在
到
之间);
①探究:线段
上是否存在定点
(
不与
、
重合),无论
如何旋转,
始终保持不变,若存在,试求出
点坐标;若不存在,请说明理由;
②试求出此旋转过程中,
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f4872dbfe4772edbfcfb8f685dd2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e3decaa07c992611050f12f0e6c7be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.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/830b8db778b49fecdf4d57c7f9cbf349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b476509d73c4a0091277b6fd5605aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)在(2)问条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3319ff1fccda7edf5514db4bcbdb33c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
①探究:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90746d4ec8c290dea6275633ae578fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②试求出此旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42df0a8ad49d2b7531868a751212d1ac.png)
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8 . 图形的探究中,常用三角形通过一些图形变换,将图形拼在一起,以探究其线段,角之间的关系,小李用两个三角形,
,
,
.开展如下的探究活动:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/d1611bcd-86dd-41db-a991-c8c7117d6dcf.png?resizew=621)
[探究1]如图1,两个三角形如图1摆放,点B在CD上时,求证:
;
[探究2]如图2,将
绕点C逆时针旋转旋转
,过点D作
交AB于点F.线段DF与AF有何数量关系?并说明理由;
[探究3]在探究2的条件下,若AB分别交CD于M,AB的延长线CE于点P(如图3),线段PM,PF,PA有何数量关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5adc18ca424552b35ab939e9d57943e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17101383eb0787edaaa35adfcd20d5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414dd77f2a63357f08fc8d61d611d69e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/d1611bcd-86dd-41db-a991-c8c7117d6dcf.png?resizew=621)
[探究1]如图1,两个三角形如图1摆放,点B在CD上时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640454e33a4238c7d8e1c78bf6f099ca.png)
[探究2]如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974762e15695c9482f34a43ffe1c8585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ae39b21e756f6067892180b3772f10.png)
[探究3]在探究2的条件下,若AB分别交CD于M,AB的延长线CE于点P(如图3),线段PM,PF,PA有何数量关系,并加以证明.
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9 . 数学活动课上,张老师引导同学们进行如下探究,如图1,将长为
的铅笔
斜靠在垂直于水平桌面
的直尺
的边沿上,一端A固定在桌面上,图2是示意图.活动一:如图3,将铅笔
绕端点A顺时针旋转,
与
交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/43f32b00-acd6-4695-9e82-60b223a73eea.png?resizew=246)
(1)数学思考:若
垂直
,设
.
①
的长是______
(用含x的代数式表示),
的长是______
(用含y的代数式表示)
②求y与x的函数关系式.
(2)活动二:若(1)中的x,y满足
,根据(1)中求得的y与x的函数关系式,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.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/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/43f32b00-acd6-4695-9e82-60b223a73eea.png?resizew=246)
(1)数学思考:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300939c07aa8b4cf92b8db94eb400fc0.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
②求y与x的函数关系式.
(2)活动二:若(1)中的x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581f4963e80a21e9bb1dac9bb79263c4.png)
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10 . 如图,
的内接三角形
中,
,延长
于D,使
,过D作
的切线
,切点为E,连接
、
、
、
.
是的
切线;
(2)探究:在
长度的变化过程中,
是否为定值?若是,请求出这个值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15bf27387ff01925a42a12440ca4fc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)探究:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
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