已知正方形ABCD,一等腰直角三角板的一个锐角顶点与A重合,将此三角板绕A点旋转时,两边分别交直线BC、CD于M、N.
(1)当M、N分别在边BC、CD上时(如图1),求证:BM+DN=MN;
(2)当M、N分别在边BC、CD所在的直线上时(如图2),线段BM、DN、MN之间又有怎样的数量关系,请直接写出结论 ;(不用证明)
(3)当M、N分别在边BC、CD所在的直线上时(如图3),线段BM、DN、MN之间又有怎样的数量关系,请写出结论并写出证明过程.
(1)当M、N分别在边BC、CD上时(如图1),求证:BM+DN=MN;
(2)当M、N分别在边BC、CD所在的直线上时(如图2),线段BM、DN、MN之间又有怎样的数量关系,请直接写出结论 ;(不用证明)
(3)当M、N分别在边BC、CD所在的直线上时(如图3),线段BM、DN、MN之间又有怎样的数量关系,请写出结论并写出证明过程.
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076824390344704/2082476465569792/STEM/c680429e12af44379dcafd4c6b857ffa.png?resizew=396)
18-19九年级·河南许昌·期中 查看更多[4]
河南省许昌地区2019届九年级(上)期中数学模拟试卷湖北省黄石市第十四中学2018-2019学年八年级上学期期中考试数学试题湖北省武汉市东湖高新区2019-2020学年八年级上学期期中数学试题(已下线)【万唯原创】2016年河北省中考数学-逆袭卷-逆袭特训34+35
更新时间:2018-10-28 16:42:41
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相似题推荐
解答题-证明题
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【推荐1】【问题呈现】某学校的数学社团成员在学习时遇到这样一个题目:
如图1,在
中,
,AD平分
交BC于点D,点E在DC的延长线上,过E作
交AC的延长线于点F,当
时,试说明:
;
【方法探究】
社团成员在研究探讨后,提出了下面的思路:
在图1中,延长线段AD,交线段EF的延长线于点M,可以用AAS证明![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
,从而得到
…,
(1)请接着完成剩下的说理过程:
【方法运用】
(2)在图1中,若
,则线段AF、EF、AB之间的数量关系为______(用含k的式子表示,不需要证明);
(3)如图2,若
,
,
,
,求出BD的长;
【拓展提升】
(4)如图3,若
,连接AE,已知
,
,
,且
,则边EF的长=______.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967d93b6a912ff75cd4b47eb8b68a6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104b98175ec7fd6958b0d9db91077fc4.png)
【方法探究】
社团成员在研究探讨后,提出了下面的思路:
在图1中,延长线段AD,交线段EF的延长线于点M,可以用AAS证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61543a63c309c18fd52aa7ac6d6188d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e532d61573265aa07696c2add38333e.png)
(1)请接着完成剩下的说理过程:
【方法运用】
(2)在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8c3d238bca387baf98ed3a556d7d0b.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fe7f306533f388843ff62fa2b5251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9a633cdf3c5f19105025d69fc089.png)
【拓展提升】
(4)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9baa6cd7ac4ef4b87eba7fd7b86b7b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496063320c49ad6d236b3b71494ed90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349bbccb3b443ace1ddbdcaf981f0536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a619ddd138a4329d3b58a59e98d7d6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968651656527872/2973769745727488/STEM/8220b3ef-a63f-486a-95ee-72008bb29213.png?resizew=456)
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【推荐2】(1)如图1,正方形
中,
、
分别是
、
边长的点,
与
交于点
,
.求证:
;
(2)如图2,矩形
中,
,
、
分别是
、
边上的点,
与
交于点
,
.求证:
;
(3)如图3,若(2)种的四边形
是平行四边形,且
,则
是否仍然成立?若成立,请证明;若不成立,请说明理由.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbfc35fc915ac7d4dc017e60ccdecbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09404bc1c56dd721386b8a7d95b6775f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998ca5534d8994d269c467645bbd5ed8.png)
(3)如图3,若(2)种的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ee7149bd58649b5c8b84439e118e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998ca5534d8994d269c467645bbd5ed8.png)
![](https://img.xkw.com/dksih/QBM/2020/3/21/2424303244001280/2424540597706752/STEM/1d7807e79d624452a2f513540a1f1fdd.png?resizew=455)
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【推荐3】在平面直角坐标系
中,已知点
,N.对于点P给出如下定义:将点P向右(
)或向左(
)平移
个单位长度,再向上(
)或向下(
)平移
个单位长度,得到点
,点
关于点N的对称点为Q,称点Q为点P的“对应点”.
(1)如图,点
,点N在线段
的延长线上,若点
,点Q为点P的“对应点”.
①在图中画出点Q;
②连接
,交线段
于点T.求证:
;
(2)
的半径为1,M是
上一点,点N在线段
上,且
(
),若p为
外一点,点Q为点P的“对应点”,连接
.当点M在
上运动时直接写出
长的最大值与最小值的差(用含t的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299b0531ace62e0752934030d0e7e4af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058315922cc0ae811d323920f7494219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a915c1a8a9304aeb307d130faaeb15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10a72461b1845357cada40904fe8a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/ecbe5280-f2cc-421f-b7b8-c19cdd2cff3b.png?resizew=217)
(1)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b9ae3974672b0ab9b2894ca06a53ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ecfca4a090b78015210871850538361.png)
①在图中画出点Q;
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef367c3276d4e043c08be24f9fa587d.png)
(2)
![](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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f780c4f6acf9d16022e038f2a92942f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6a8090b98be10b14f6ef69b126e81c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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【推荐1】如图1,在平面直角坐标系中,
,
,
的垂直平分线交
轴与点
,连接
,
为第一象限内的点.
![](https://img.xkw.com/dksih/QBM/2020/3/29/2429832951955456/2431589636956160/STEM/e3c35da08603410e8d8b20a5098bdcd5.png?resizew=322)
(1)求点
坐标;
(2)当
时,求
的值;
(3)如图2,点
为
轴上的一个动点,当
为等腰三角形时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ad1f2017ff856c842da9e1f00ea621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce90d1e663ca4df813f44dbd81da14a6.png)
![](https://img.xkw.com/dksih/QBM/2020/3/29/2429832951955456/2431589636956160/STEM/e3c35da08603410e8d8b20a5098bdcd5.png?resizew=322)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2cf4e9fccc039b1dbdeb9cce2d38d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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名校
【推荐2】如图,在
中,
,
,P,D为射线AB上两点(点D在点P的左侧),且
,连接CP.以P为中心,将线段PD逆时针旋转
得线段PE.
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990549279719424/2991058623856640/STEM/b06863dd-70a7-4dea-a826-98e45d863bf3.png?resizew=617)
(1)如图1,当四边形ACPE是平行四边形时,画出图形,并直接写出n的值;
(2)当
时,M为线段AE的中点,连接PM.
①在图2中依题意补全图形;
②用等式表示线段CP与PM之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e26a673d521bed4ecc9f9bbde29fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d58b2b426fb2c6d873ab6e37ba684.png)
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990549279719424/2991058623856640/STEM/b06863dd-70a7-4dea-a826-98e45d863bf3.png?resizew=617)
(1)如图1,当四边形ACPE是平行四边形时,画出图形,并直接写出n的值;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3165578bc9fa3b5697726d2b6b95be1f.png)
①在图2中依题意补全图形;
②用等式表示线段CP与PM之间的数量关系,并证明.
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真题
名校
【推荐1】已知正方形
,
,
为平面内两点.
(1)如图1,当点
在边
上时,
,且
,
,
三点共线.求证:
;
【类比应用】
(2)如图2,当点
在正方形
外部时,
,
,且
,
,
三点共线.猜想并证明线段
,
,
之间的数量关系;
【拓展迁移】
(3)如图3,当点
在正方形
外部时,
,
,
,且
,
,
三点共线,
与
交于
点.若
,
,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)
(1)如图1,当点
![](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/3efffb3e6a571832b723b3c5795b8e8c.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
【类比应用】
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【拓展迁移】
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeeee5f39ee6f9c3ea01ada75d63b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6b9ccc3a025e4f11717cfd7ab354b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc95af9238cf516b1f60fd4c51b409a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】如图1,在△ABC中,
于点O,
,过点A作
于点H,交BO于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/e8acd875-65ae-44f5-8826-c72c5d5d4be5.png?resizew=431)
(1)求线段OP的长度;
(2)连接OH,求证:点O到∠AHC的两边距离相等;
(3)如图2,若点D为AB的中点,点M为线段BO延长线上一动点,连接MD,过点D作
交线段OA延长线于N点,则
的值是否发生改变,如改变,求出该值的变化范围;若不改变,求该式子的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5da97f8b32e6f5d9e9d5816de55ba9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1183c8679d87be566cad5da096da77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/25/e8acd875-65ae-44f5-8826-c72c5d5d4be5.png?resizew=431)
(1)求线段OP的长度;
(2)连接OH,求证:点O到∠AHC的两边距离相等;
(3)如图2,若点D为AB的中点,点M为线段BO延长线上一动点,连接MD,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0dd5ba3078141483cf3ae27957a513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb2ed2d728b88b050c8b0a89ddcfaac.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】中国高铁迅猛发展,给我们的出行带来极大的便捷,如图1,是某种新设计动车车头的纵截面一部分,曲线OBA是一开口向左,对称轴正好
是水平线OC的抛物线的一部分,点A、B是车头玻璃罩的最高点和最低点,AC、BD是两点到车厢底部的距离,OD=1.5米,BD=1.5米,AC=3米,请你利用所学的函数知识解决以下问题.
(1)为了方便研究问题,需要把曲线OBA绕点O旋转转化为我们熟悉的函数,请你在所给的方框内,画出你旋转后函数图象的草图,在图中标出点O、A、B、C、D对应的位置,并求你所画的函数的解析式.
(2)如图2,驾驶员座椅安装在水平线OC上一点P处,实验表明:当PA+PB最小时,驾驶员驾驶时视野最佳,为了达到最佳视野,求OP的长.
(3)驾驶员头顶到玻璃罩的高度至少为0.3米才感到压抑,一个驾驶员坐下时头顶到椅面的距离为1米,在(2)的情况下,座椅最多条件到多少时他才感到舒适?
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927347231735808/1927685214355456/STEM/98b0ca65fd824d0fbf172c86e713c178.png?resizew=5)
(1)为了方便研究问题,需要把曲线OBA绕点O旋转转化为我们熟悉的函数,请你在所给的方框内,画出你旋转后函数图象的草图,在图中标出点O、A、B、C、D对应的位置,并求你所画的函数的解析式.
(2)如图2,驾驶员座椅安装在水平线OC上一点P处,实验表明:当PA+PB最小时,驾驶员驾驶时视野最佳,为了达到最佳视野,求OP的长.
(3)驾驶员头顶到玻璃罩的高度至少为0.3米才感到压抑,一个驾驶员坐下时头顶到椅面的距离为1米,在(2)的情况下,座椅最多条件到多少时他才感到舒适?
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927347231735808/1927685214355456/STEM/e462c166d81240958d42dbf13d0720f2.png?resizew=493)
您最近一年使用:0次
解答题-作图题
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较难
(0.4)
【推荐2】问题背景:
(1)如图1,在△ABC和△CDE中,AB=AC,EC=ED,∠BAC=∠CED,请在图中作出与△BCD相似的三角形.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469395876093952/2469852760399872/STEM/1a20ad13069d49268ac8d4e9137fcc77.png?resizew=434)
迁移应用:
(2)如图2,E为正方形ABCD内一点,∠DEB=135°,在DE上取一点G,使得BE=EG,延长BE交AG于点F,求AF:FG的值.
联系拓展:
(3)矩形ABCD中,AB=6,AD=8,P、E分别是AC、BC上的点,且四边形PEFD为矩形,若△PCD是等腰三角形时,直接写出CF的长.
(1)如图1,在△ABC和△CDE中,AB=AC,EC=ED,∠BAC=∠CED,请在图中作出与△BCD相似的三角形.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469395876093952/2469852760399872/STEM/1a20ad13069d49268ac8d4e9137fcc77.png?resizew=434)
迁移应用:
(2)如图2,E为正方形ABCD内一点,∠DEB=135°,在DE上取一点G,使得BE=EG,延长BE交AG于点F,求AF:FG的值.
联系拓展:
(3)矩形ABCD中,AB=6,AD=8,P、E分别是AC、BC上的点,且四边形PEFD为矩形,若△PCD是等腰三角形时,直接写出CF的长.
您最近一年使用:0次