如图,平行四边形
在平面直角坐标系中,
,若
、
的长是关于
的一元二次方程
的两个根,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/0cb3b8be-3902-4356-8216-638df7ff810f.png?resizew=188)
(1)求
的值.
(2)若E为
轴上的点,且
,求出点E的坐标,并判断
与
是否相似?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dac77366c746161a381e0589d63e451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c7a677b9230fe19d301828469ef1f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/0cb3b8be-3902-4356-8216-638df7ff810f.png?resizew=188)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ffdb117605acb86699952e445db2aa.png)
(2)若E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70ada6bc190fcbb6f0eee2e23dd89cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5a1e516644950ef35eafd859b262f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532684511ddb43fbebc5ae0694f8b209.png)
更新时间:2023-12-23 19:01:11
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解答题-问答题
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适中
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【推荐1】解方程:
(1)3(x+1)2=12;
(2)(漳州中考)x2-4x+1=0;
(3)2(t-1)2+t=1;
(4)(3x-1)2-4(2x+3)2=0.
(1)3(x+1)2=12;
(2)(漳州中考)x2-4x+1=0;
(3)2(t-1)2+t=1;
(4)(3x-1)2-4(2x+3)2=0.
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【推荐2】用适当的方法解下列方程:(1)3x²+x=3x+1;(2)(2y﹣5)²=(3y+1)²
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【推荐1】如图,在梯形
中,
,
,
,
,
,动点
从点
出发,沿射线
的方向以每秒
的速度运动到
点返回,动点
从点
出发,在线段
上以每秒
的速度向点
运动,点
,
分别从点
,
同时出发,当点
运动到点
时,点
随之停止运动,设运动的时间为
(秒).
为何值时,四边形
是平行四边形;
(2)当
为何值时,以
,
,
,
为顶点的梯形面积等于
?
(3)是否存在点
,使
是等腰三角形?若存在,请求出所有满足要求的
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede0bcdce110dbe6f46a4a7ba7e6059d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccdfbd8fd6f54646363cd44e47d7c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5959113de815ad1dc1227583ce0c3920.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a834fff6a787e220ea98b175ddfe8a6.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd3355d3bee7e168af3bec0662b7dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
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【推荐2】如图在正方形网格中,已知顶点为格点的
.请仅用无刻度的直尺按下列要求作图.
边的垂直平分线;
(2)在图2中,作
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图2中,作
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解答题-证明题
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【推荐1】如图,等腰三角形
中,
.以
为直径的
交
于点
,交
于点
,过点
作
的切线,交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394072900337664/2394427581841408/STEM/dd0319ba19ce469ba93e1c3711994bf5.png?resizew=140)
(1)求证:
;
(2)若
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394072900337664/2394427581841408/STEM/dd0319ba19ce469ba93e1c3711994bf5.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7170efdbbef5c6db5ce230c124510f.png)
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【推荐2】如图1,点C将线段AB分成两部分,如果
,那么称点C为线段AB的黄金分割点.某研究小组在进行课题学习时,由黄金分割点联想到“黄金分割线”,类似地给出“黄金分割线”的定义:直线l将一个面积为S的图形分成两部分,这两部分的面积分别为S1,S2,如果
,那么称直线l为该图形的黄金分割线.
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573637870985216/1573637949431808/STEM/94acf57537344a27bf64d40ca7a2518e.png)
(1)研究小组猜想:在△ABC中,若点D为AB边上的黄金分割点(如图2),则直线CD是△ABC的黄金分割线.你认为对吗?为什么?
(2)研究小组在进一步探究中发现:过点C任作一条直线交AB于点E,再过点D作直线DF∥CE,交AC于点F,连接EF(如图3),则直线EF也是△ABC的黄金分割线.请你说明理由.
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573637870985216/1573637949431808/STEM/72baa8a88e4a45648b5889f6a5a86b63.png)
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573637870985216/1573637949431808/STEM/af6add82160a4c6a9698f7404a038087.png)
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573637870985216/1573637949431808/STEM/94acf57537344a27bf64d40ca7a2518e.png)
(1)研究小组猜想:在△ABC中,若点D为AB边上的黄金分割点(如图2),则直线CD是△ABC的黄金分割线.你认为对吗?为什么?
(2)研究小组在进一步探究中发现:过点C任作一条直线交AB于点E,再过点D作直线DF∥CE,交AC于点F,连接EF(如图3),则直线EF也是△ABC的黄金分割线.请你说明理由.
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【推荐1】直线y=x+b与x轴交于点C(4,0),与y轴交于点B,并与双曲线y=
(x<0)交于点A(﹣1,n).
![](https://img.xkw.com/dksih/QBM/2016/3/23/1574187109720064/1574187115528192/STEM/86b8f4eed4514c07b26ca8ef112ca953.png)
(1)求直线与双曲线的解析式.
(2)连接OA,求∠OAB的正弦值.
![](https://img.xkw.com/dksih/QBM/2016/3/23/1574187109720064/1574187115528192/STEM/3ba8234803a54f3da5ebe38dc5df90cb.png)
![](https://img.xkw.com/dksih/QBM/2016/3/23/1574187109720064/1574187115528192/STEM/86b8f4eed4514c07b26ca8ef112ca953.png)
(1)求直线与双曲线的解析式.
(2)连接OA,求∠OAB的正弦值.
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真题
名校
【推荐2】知识再现:如图1,在Rt△ABC中,∠C=90°,∠A,∠B,∠C的对边分别为a,b,c.
∵
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9250a13b836e51e0b0514f2063424d91.png)
∴
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7f90d9ae3cdb23e5c9d2b0d1843eb2.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf9a85dda185f77d852e4b5444ac4e.png)
,
,
之间的关系,并写出探究过程.
(2)解决问题:如图3,为测量点A到河对岸点B的距离,选取与点A在河岸同一侧的点C,测得AC=60m,∠A=75°,∠C=60°.请用拓展探究中的结论,求点A到点B的距离.
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aef4ec0a3bb0fe551b74be20f650578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9250a13b836e51e0b0514f2063424d91.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34f554ac43f9d0ef1987545a9977cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7f90d9ae3cdb23e5c9d2b0d1843eb2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf9a85dda185f77d852e4b5444ac4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1075d972439d6a0fbbc04cf439257d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9c124de18c6f20178349302186c553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7666e569aeea50f726fb694446fc0f72.png)
(2)解决问题:如图3,为测量点A到河对岸点B的距离,选取与点A在河岸同一侧的点C,测得AC=60m,∠A=75°,∠C=60°.请用拓展探究中的结论,求点A到点B的距离.
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