如图,已知一个三角形纸片
边的长为8,
边上的高为6,
和
都为锐角,M为
一动点(点M与点A、B不重合),过点M作
,交
于点N,在
中,设
的长为x,
上的高为h.
(1)请你用含x的代数式表示h.
(2)将
沿
折叠,使
落在四边形
所在平面,设点A落在平面的点为
,
与四边形
重叠部分的面积为y,当x为何值时,y最大,最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0225515b33e88e39a375cf689d8eea8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e987ef5b2677d3b860a9882770ac718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/ee7a4fd1-fe6f-4fb8-957b-183595c97636.png?resizew=141)
(1)请你用含x的代数式表示h.
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af6b531f532eb39c26d36e9dd97254d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3bacc06686947aeaf85e71b2e46aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af6b531f532eb39c26d36e9dd97254d.png)
2019·浙江杭州·模拟预测 查看更多[1]
(已下线)【新东方】 初中数学956【2019年】【初三下】
更新时间:2020-12-24 08:09:57
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图①,OABC是一张放在平面直角坐标系中的矩形纸片,O为原点,点A在
轴的正半轴上,点C在
轴的正半轴上,OA=5,OC=4.
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570255218229248/2570682711932928/STEM/411577a0038f4c93be02a984c81b02e3.png?resizew=220)
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570255218229248/2570682711932928/STEM/f0969e0342ef43e0a3713f36c40717ac.png?resizew=220)
(1)在OC边上取一点D,将纸片沿AD翻折,使点O落在BC边上的点E处,则E点的坐标为____________;D点的坐标为____________.
(2)如图②,若AE上有一动点P(不与A、E重合)自A点沿AE方向向E点匀速运动,运动的速度为每秒1个单位长度,设运动的时间为
秒
,过P点作ED的平行线交AD于点M,过点M作AE的平行线交DE于点N.求四边形PMNE的面积S与时间
之间的函数关系式;
(3)在(2)的条件下,当
为何值时,以A、M、E为顶点的三角形为等腰三角形,并求出相应时刻点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570255218229248/2570682711932928/STEM/411577a0038f4c93be02a984c81b02e3.png?resizew=220)
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570255218229248/2570682711932928/STEM/f0969e0342ef43e0a3713f36c40717ac.png?resizew=220)
(1)在OC边上取一点D,将纸片沿AD翻折,使点O落在BC边上的点E处,则E点的坐标为____________;D点的坐标为____________.
(2)如图②,若AE上有一动点P(不与A、E重合)自A点沿AE方向向E点匀速运动,运动的速度为每秒1个单位长度,设运动的时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577fb839669e9b32c0aa4b2a32335d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cff1d869bfb86ba341fbe7330aac46a.png)
过点
,顶点
在第三象限,
,
是抛物线的对称轴
上的两点,且
,在直线
左侧以
为边作正方形
,点
恰好在抛物线上.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490335364186112/2492940390924288/STEM/37bcb6d3ead949d4a7b7981590b27a5b.png?resizew=232)
(1)用含
的式子表示
;
(2)求证:点
和点
关于直线
对称;
(3)判断直线
和直线
(
是常数,且
)的交点是否在抛物线上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cff1d869bfb86ba341fbe7330aac46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072f941f1fb5fff8b161c589463ddc9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a23e87d16c32b5aa4357f481b5808a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cead256658d6f874b3b298f8dd2c055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490335364186112/2492940390924288/STEM/37bcb6d3ead949d4a7b7981590b27a5b.png?resizew=232)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c1c20ae4c40deddf64491da05c9deb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d106f5135c3c4130205ba559633224f.png)
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【推荐1】已知正方形ABCD和正方形CEGF,连接AC,AG,BE.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897214050942976/2960242177236992/STEM/b3583b670f744c8b9f6527dccfdc7822.png?resizew=343)
(1)如图1,探究线段AG与BE之间的数量关系,并证明;
(2)当B,E,F三点在一条直线上时,如图2,延长CG交AD于点H.若
,
,求BC的长.
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897214050942976/2960242177236992/STEM/b3583b670f744c8b9f6527dccfdc7822.png?resizew=343)
(1)如图1,探究线段AG与BE之间的数量关系,并证明;
(2)当B,E,F三点在一条直线上时,如图2,延长CG交AD于点H.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978151ee28b5d0b797786526d303d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea88e1806b38ad1e335bdfc4612809c6.png)
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名校
【推荐2】如图,在
中,
,
,
,点
,
分别在边
,
上,
.将
绕点
顺时针旋转得到
,其中
,
的对应点为
,
,且
在
上.
长的取值范围;
(2)求
的度数;
(3)设
,
,问
是
的函数吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d794fa98ade13e9a141b45a139844914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457c6935fc4305838a02325c4e08017a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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