如图,在锐角三角形
中,边
,高
,矩形
的顶点E、H分别在
、
上,F、G在
上,
与
交于点N.
(1)试说明:
;
(2)若矩形
是正方形,求
的长;
(3)当
为何值时,矩形
的面积最大?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ac44e71fbdcb9d84dca887dfb4f28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea14e8b5d80ab467065d7a87a5d42a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/6909422c-1262-42af-89b5-0e3c1a8038c3.png?resizew=158)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e1f99c673b2322894d49c8826aa74.png)
(2)若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
更新时间:2024-03-04 10:27:51
|
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解答题-问答题
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适中
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【推荐1】如图所示,直线y=
+3与x轴、y轴分别交于A、B两点,P是线段AB的中点,抛物线y=-
x2+bx+c经过点A,P,O(原点).
(1)求抛物线的表达式;
(2)在x轴上方的抛物线上是否存在一点Q,使∠QAO=45°?如果存在,求出Q点的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f998969c17f2a83bc62f2e1c767e806b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4756acc50c489cbef2305e4259c988c.png)
(1)求抛物线的表达式;
(2)在x轴上方的抛物线上是否存在一点Q,使∠QAO=45°?如果存在,求出Q点的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/6/4/1960053750267904/1960689942077440/STEM/1ce8414ddd4041f596f5e4bb308919d9.png?resizew=118)
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【推荐2】已知如图,抛物线的顶点
的坐标为
,且与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352714074038272/2352936452628480/STEM/13a2b1dc-401d-481c-ada9-5b3c911fd76d.png?resizew=166)
(1)求该函数的关系式;
(2)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf03e87dd5d82d30fd01be26cee1f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://img.xkw.com/dksih/QBM/2019/12/11/2352714074038272/2352936452628480/STEM/13a2b1dc-401d-481c-ada9-5b3c911fd76d.png?resizew=166)
(1)求该函数的关系式;
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
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解答题-作图题
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真题
【推荐3】如图,在平面直角坐标系中,直线
与抛物线
交于A、B两点,点A在x轴上,点B的横坐标为-8.
(1)求该抛物线的解析式;
(2)点P是直线AB上方的抛物线上一动点(不与点A、B重合),过点P作x轴的垂线,垂足为C,交直线AB于点D,作PE⊥AB于点E.
①设△PDE的周长为l,点P的横坐标为x,求l关于x的函数关系式,并求出l的最大值;
②连接PA,以PA为边作图示一侧的正方形APFG.随着点P的运动,正方形的大小、位置也随之改变.当顶点F或G恰好落在y轴上时,直接写出对应的点P的坐标.
![](https://img.xkw.com/dksih/QBM/2011/7/20/1573225198395392/1573225250816000/STEM/2b058d3049344ef2b5b6f0fe10ad7963.png?resizew=233)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91cde30684d196623b5e023917c8d2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
(1)求该抛物线的解析式;
(2)点P是直线AB上方的抛物线上一动点(不与点A、B重合),过点P作x轴的垂线,垂足为C,交直线AB于点D,作PE⊥AB于点E.
①设△PDE的周长为l,点P的横坐标为x,求l关于x的函数关系式,并求出l的最大值;
②连接PA,以PA为边作图示一侧的正方形APFG.随着点P的运动,正方形的大小、位置也随之改变.当顶点F或G恰好落在y轴上时,直接写出对应的点P的坐标.
![](https://img.xkw.com/dksih/QBM/2011/7/20/1573225198395392/1573225250816000/STEM/2b058d3049344ef2b5b6f0fe10ad7963.png?resizew=233)
![](https://img.xkw.com/dksih/QBM/2011/7/20/1573225198395392/1573225250816000/STEM/416cd307ff9a4c42852b2c8db51d29cc.png?resizew=222)
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解答题-证明题
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名校
【推荐1】如图,四边形
是正方形,点F是射线
上的动点,连接
,以
为对角线作正方形
(C,G,F,E按逆时针排列),连接
,
.
(1)当点F在线段
上时,
①求证:
;
②求证:
;
(2)设正方形
的面积为25,正方形
的面积为13,请直接写出以C,G,D,F为顶点的四边形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6956e80605da673953b2b0e9703efa22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/3404a310-9817-4788-8fe4-295891e1634f.png?resizew=152)
(1)当点F在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1596f7c0d0bab4e7e586d705d323e0d8.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ffa968ac0c14afed037978cab4c920.png)
(2)设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6956e80605da673953b2b0e9703efa22.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知四边形
,
是
边上的一点,
是
的中点,
平分
.
(1)若四边形
是正方形,如图1:
①求证:
;
②若
,求
的长;
(2)若四边形
是矩形,如图2,则
这一结论是否成立?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e385b42f17d8d22605e6fb2b6c51895.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/718a3b98-22a3-46d6-89b0-c5f004f2d84b.png?resizew=260)
(1)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3ba528adff5d4f3a26a03df3eaecce.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3ba528adff5d4f3a26a03df3eaecce.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知一次函数y1=kx+b的图象交反比例函数的
图象于点A、B,交x轴于点C.若点A的坐标是(2,-4),
(1)求m的值.
(2)若
,求一次函数的解析式及点C的坐标;
(3)观察图象,直接写出当y1≥y2时的x范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812a07cb50786c63d69aaedb5ba3793c.png)
(1)求m的值.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2961c2afded1adb0e7a77c65cba0a2e9.png)
(3)观察图象,直接写出当y1≥y2时的x范围.
![](https://img.xkw.com/dksih/QBM/2020/9/29/2560243552403456/2566108995977216/STEM/ca59f02239894c1f9e71b9262030750d.png?resizew=177)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,
,
是
上一点,以
为半径的
与
相切,切点为
,连接
,
与
相交于点
.
是
的角平分线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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