如图,在等腰三角形
中,底边
,腰长为
,以
所在直线为x轴,以
边上的高所在的直线为y轴建立平面直角坐标系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/350ceb96-4150-490e-a6b2-793e03c8c9d2.png?resizew=199)
(1)直接写出点A、B、C的坐标.
(2)一动点P以
的速度沿底边从点B向点C运动(P点不运动到C点),设点P运动的时间为t(单位:s)
①当t为何值时,
是等腰三角形?并求出此时点P的坐标.
②当t为何值时,
与一腰垂直?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9938aea41f03701b233dee15809f2126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/350ceb96-4150-490e-a6b2-793e03c8c9d2.png?resizew=199)
(1)直接写出点A、B、C的坐标.
(2)一动点P以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a8fdacf796a72d9a5af1740a0e30e3.png)
①当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
②当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
21-22八年级上·浙江·期末 查看更多[1]
(已下线)【新东方】 初中数学20210625-007【初二上】
更新时间:2021-07-05 20:16:23
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在平面直角坐标系中(单位长度为1cm),已知点
,且
.
,
.
(2)如图,若点E是第一象限内的一点,且
轴,过点E作x轴的平行线a,与y轴交于点A,点P从点E处出发,以每秒2cm的速度沿直线a向左移动,点Q从原点O同时出发,以每秒1cm的速度沿x轴向右移动.
①经过几秒
?
②若某一时刻以A、O、Q、P为顶点的四边形的面积是
,求此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eeef0935affcf972c692954d38077d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacde36da6b81e1e1265dce14809c1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(2)如图,若点E是第一象限内的一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73297356dfd38e7243b9204b77e82957.png)
①经过几秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1eb2c03e4f6fa910f4cd6fad5d13a14.png)
②若某一时刻以A、O、Q、P为顶点的四边形的面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9829733240df90d85e5349c3dc5985.png)
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【推荐2】在平面直角坐标系中,
为
轴上一点,
为
轴上的一点,且
,
满足
,
的平分线交
轴于点
.
(1)求
,
两点的坐标;
(2)如图1所示,
为线段
上的一个动点,过
点作
的垂线交
轴于点
,
为垂足,
的平分线交直线
于点
,当点
运动时,
的度数是否改变?若不变,请你求出
的度数;若改变,请说明理由;
(3)如图2所示,若过点
作
的平行线交
轴于点
,
的平分线交直线
于点
,当点
运动时,
的度数是否改变?若不变,请求出
的度数,若改变,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3160fc73f2a90ae4a1a97351ab2673b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9199b50dd0036be9b764c621d1d46f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/be6de9439e73f8a16b4b64c8ef5480f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/34a94ee8-49ca-4660-b4aa-2289d7b5513f.png?resizew=483)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图1所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/b6ca52142b566040f7a605109dd6ff55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
(3)如图2所示,若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ca52142b566040f7a605109dd6ff55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
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名校
【推荐1】根据背景素材,探索解决问题.
生活中的数学﹣﹣﹣﹣自动旋转式洒水喷头如何灌溉草坪 | |||
背景素材 | 数学来源于生活,九4班分四个小组,开展数学项目式实践活动,获取所有数据共享,对草坪喷水管建立数学模型.草坪装有1个自动旋转式洒水喷头,灌溉园林草坪.如图1所示,观察喷头可顺、逆时针往返喷洒. | ||
| |||
甲小组在图2中建立合适的直角坐标系,喷水口中心O有一喷水管![]() | 乙小组在甲小组基础上,测量得距洒水喷头水平距离较远若干米的E处,正上方有一树枝叶F,旋转式喷洒水柱外端刚好碰到树叶F的最低处. | ||
丙小组在甲小组基础上,测量得喷水口中心O到水柱的最外落水点D距离为半径,建立![]() ![]() | |||
问题解决 | |||
任务1 | 获取数据 | 丁小组测量得喷头的高![]() ![]() | |
解决问题 | 求出水柱所在抛物线的函数解析式. | ||
任务2 | 获取数据 | 丁小组测树叶F距水平地面最低高度![]() ![]() ![]() | |
解决问题 | 求![]() | ||
任务3 | 推理计算 | 丁小组观察自动旋转式洒水喷头可顺、逆时针往返喷洒,可平面旋转角度不超过![]() ①这个喷头最多可洒水多少平方米? ②在①条件下,此时 ![]() |
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【推荐2】如果三角形有一边上的中线恰好与这边的比值是5:6,那么我们称这个三角形为“智慧三角形”.
(1)如图△ABC中,AB=AC=
,BC=6,求证:△ABC是“智慧三角形”;
(2)在Rt△ABC中,∠C=90°,AC=12,若△ABC是“智慧三角形”,求BC的长.
(1)如图△ABC中,AB=AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcf43ba416adeb723cebe4aee6bbe34.png)
(2)在Rt△ABC中,∠C=90°,AC=12,若△ABC是“智慧三角形”,求BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/92e27df3-806f-4f2b-8db5-c91b54f40e10.png?resizew=179)
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【推荐1】如图,四边形
是边长为a的正方形,点G、E分别是边
、
的中点,
,且
交正方形外角的平分线
于点F.
(1)证明:
;
(2)求
的面积.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/3d38e92d-9c48-4c64-9600-55999af84de5.png?resizew=215)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bff9736aca7ac3055e4cd9c9761538.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】如图,
中两条互相垂直的弦
,
交于点
.
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943069528711168/2954288171327488/STEM/2cc59d84-988b-455d-b717-73b10e2c178f.png?resizew=187)
(1)
于点
,
,
的半径长为
,求
的长;
(2)点
在
上,且
交
于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943069528711168/2954288171327488/STEM/2cc59d84-988b-455d-b717-73b10e2c178f.png?resizew=187)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405a34caaf30b8bd540aa0a1e699df25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fad110cc650ed13eb266f77b69610bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dafaeda9177baa0f937f58f680de448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bad3d9422cf9c0b078900b3c507e87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c0d6068866683547b733dbe005031a6.png)
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