阅读:如图1,在△ABC中,BE是AC边上的中线, D是BC边上的一点,CD:BD=1:2,AD与BE相交于点P,求
的值.小昊发现,过点A作AF∥BC,交BE的延长线于点F,通过构造△AEF,经过推理和计算能够使问题得到解决(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/fff076fe-8385-4c22-abf9-3c69275ce352.png?resizew=404)
(1)
的值为 ;
(2)参考小昊思考问题的方法,解决问题:
如图3,在△ABC中,∠ACB=90°,点D在BC的延长线上,AD与AC边上的中线BE的延长线交于点P,DC:BC:AC=1:2:3 .
求
的值;
若CD=2,求BP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219679f2c28a0418f62d9861b7aec02f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/fff076fe-8385-4c22-abf9-3c69275ce352.png?resizew=404)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219679f2c28a0418f62d9861b7aec02f.png)
(2)参考小昊思考问题的方法,解决问题:
如图3,在△ABC中,∠ACB=90°,点D在BC的延长线上,AD与AC边上的中线BE的延长线交于点P,DC:BC:AC=1:2:3 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219679f2c28a0418f62d9861b7aec02f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
16-17九年级上·福建泉州·期中 查看更多[6]
2016届福建省南安市柳城片区九年级上学期期中考试数学试卷江苏省无锡市前洲中学2017届九年级上学期期中考试数学试题江苏省无锡市惠山区2017届九年级上学期期中考试数学试题河北省滦南县2018届九年级上学期期中联考数学试题人教版九年级下册第二十七章《相似》全章测试(已下线)专题20 A字型和8字型模型证相似-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(北师大版)
更新时间:2016-12-06 04:00:12
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图所示.在△ABC中,∠ACB=90°,AC=BC,过点C任作一直线PQ,过点A作
于点M,过点B作BN
PQ于点N.
![](https://img.xkw.com/dksih/QBM/2019/10/28/2321777883676672/2322484308115456/STEM/ba824a17d31b4c59a72cca7905e3e88b.png?resizew=431)
(1)如图1,当M、N在△ABC的外部时,MN、AM、BN有什么关系呢?为什么?
(2)如图2,当M、N在△ABC的内部时,(1)中的结论是否仍然成立?若成立,请说明理由;若不成立,请指出MN与AM、BN之间的数关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a370f40d582e197470a37e8a2176ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2019/10/28/2321777883676672/2322484308115456/STEM/ba824a17d31b4c59a72cca7905e3e88b.png?resizew=431)
(1)如图1,当M、N在△ABC的外部时,MN、AM、BN有什么关系呢?为什么?
(2)如图2,当M、N在△ABC的内部时,(1)中的结论是否仍然成立?若成立,请说明理由;若不成立,请指出MN与AM、BN之间的数关系并说明理由.
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【推荐2】如图1,已知等腰
,
,
,
于点
,点
是线段
上一点,点
是
延长线上一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893567497601024/2949677725278208/STEM/f00364d8-1963-41e6-9b1e-102b739658be.png?resizew=452)
(1)当点
与点
重合时,即
,如图2,求
的度数;
(2)求证:
;
(3)求证:
.
![](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/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3224eea0f01fdff8b9c258beffc50e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893567497601024/2949677725278208/STEM/f00364d8-1963-41e6-9b1e-102b739658be.png?resizew=452)
(1)当点
![](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/668818591dce160d4f46513f89bc2f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591aaaa933113f50307c959bfb6b0016.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286169c09ae923abf015e764a0664044.png)
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【推荐1】如图,
为
的直径,
为
的切线,M是
上一点,过点M的直线与
交于点B,D两点,与
交于点E,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/8c1c9d92-d43e-4f42-9e41-7e40a5b6f421.png?resizew=170)
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/8c1c9d92-d43e-4f42-9e41-7e40a5b6f421.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594c95ec1d027b7fa228f341d0b253a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3925432297075733e22c4597cea728.png)
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解答题-证明题
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适中
(0.65)
【推荐2】在菱形
中,以
为直径作半圆
交
于点
,交
于点
.
;
(2)当菱形的边长为5,
,求
和
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1150e7caf86393601b45976f94f3e5.png)
(2)当菱形的边长为5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9938f4e86299b789840a58159eb9527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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