如图,在平面直角坐标系中,点A,C分别在x轴,y轴的正半轴上,四边形OABC是正方形,点
在边AB上,连接OE,作
于点E,分别交x轴,BC于点D,F.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991389821427712/2994709225873408/STEM/437ed080-aa96-4205-ab35-f3be0bb8145b.png?resizew=189)
(1)求
的值;
(2)求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9433bf9c29c2a606923a3fc1d1c9aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77eda028051b34e285ffc1434540b662.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991389821427712/2994709225873408/STEM/437ed080-aa96-4205-ab35-f3be0bb8145b.png?resizew=189)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120737593aa43440f8461d0421ca33e9.png)
(2)求点F的坐标.
更新时间:2022-06-05 11:34:25
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【推荐1】已知在长方形ABCD中,AB=4,
,O为BC上一点,
,如图所示,以BC所在直线为x轴,O为坐标原点建立平面直角坐标系,M为线段OC上的一点.
(1)若点M的坐标为(1,0),如图①,以OM为一边作等腰△OMP,使点P在长方形ABCD的一边上,则符合条件的等腰三角形有几个?请直接写出所有符合条件的点P的坐标;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/c8b7ece4-0058-4c64-8811-68edaca05db6.png?resizew=270)
(2)若将(1)中的点M的坐标改为(4,0),其它条件不变,如图②,那么符合条件的等腰三角形有几个?求出所有符合条件的点P的坐标;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/45f62e1d-e252-4afd-8db3-d4b19bd00dc7.png?resizew=272)
(3)若将(1)中的点M的坐标改为(5,0),其它条件不变,如图③,请直接写出符合条件的等腰三角形有几个.(不必求出点P的坐标)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e6efbdb0fccd9dd3fad34f6cf680f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2048e3806dd4c84d8788e7d8c06b941.png)
(1)若点M的坐标为(1,0),如图①,以OM为一边作等腰△OMP,使点P在长方形ABCD的一边上,则符合条件的等腰三角形有几个?请直接写出所有符合条件的点P的坐标;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/c8b7ece4-0058-4c64-8811-68edaca05db6.png?resizew=270)
(2)若将(1)中的点M的坐标改为(4,0),其它条件不变,如图②,那么符合条件的等腰三角形有几个?求出所有符合条件的点P的坐标;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/45f62e1d-e252-4afd-8db3-d4b19bd00dc7.png?resizew=272)
(3)若将(1)中的点M的坐标改为(5,0),其它条件不变,如图③,请直接写出符合条件的等腰三角形有几个.(不必求出点P的坐标)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/490b5ac5-f1a1-428a-810e-847a5f5bc6d3.png?resizew=284)
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【推荐2】我们规定在网格内的某点进行一定条件操作到达目标点:
代表所有的水平移动,
代表向右水平移动1个单位长度,
代表向左平移1个单位长度;
代表上下移动,
代表向上移动1个单位长度,
代表向下移动1个单位长度,
表示点
在网格内先一次性水平移动,在此基础上再一次性上下移动.
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096677805268992/3098725952856064/STEM/1ddfda66598e48cdbf14fc239dbf4926.png?resizew=500)
(1)如图1,在网格中标出
移动后所到达的目标点
;
(2)如图2,在网格中的点
到达目标点
,写出点
的移动方法__________________;
(3)如图3,在网格内有格点线段(即端点在格点上的线段)
,现需要由点
出发,到达目标点
,使得
、
、
三点构成的格点三角形(即顶点在格点上的三角形)是等腰直角三角形,在图中标出所有符合条件的点
的位置并写出点
的移动方法.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b85152c1459e7d14bfebca89b9a633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175b4a25fe680118e1ca2ad0429d6606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e7552aa506779b2fe0b08799ad0018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda45a7bfd8770afd8ffa3cba377f8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da7b2ff64b7b16f151d36d07a710495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096677805268992/3098725952856064/STEM/1ddfda66598e48cdbf14fc239dbf4926.png?resizew=500)
(1)如图1,在网格中标出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9731d9cc5b20d9662b1fbf665d751576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(2)如图2,在网格中的点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如图3,在网格内有格点线段(即端点在格点上的线段)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】在
中,∠C=90°,AC>BC,D是AB的中点.E为直线上一动点,连接DE,过点D作DF⊥DE,交直线BC于点F,连接EF.
(1)如图1,当E是线段AC的中点时,设
,求EF的长(用含
的式子表示);
(2)当点E在线段CA的延长线上时,依题意补全图2,用等式表示线段AE,EF,BF之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)如图1,当E是线段AC的中点时,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/664ba3c4150b13b0a05c77316563ebd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)当点E在线段CA的延长线上时,依题意补全图2,用等式表示线段AE,EF,BF之间的数量关系,并证明.
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【推荐2】图1是某款自动旋转圆形遮阳伞,伞面完全张开时张角呈
,图2是其侧面示意图.已知支架
长为2.6米,且垂直于地面
,悬托架
米,点
固定在伞面上,且伞面直径
是
的4倍.当伞面完全张开时,点
始终共线.为实现遮阳效果最佳,伞面装有接收器可以根据太阳光线的角度变化,自动调整手柄
沿着
移动,以保证太阳光线与
始终垂直.某一时刻测得
米.请求出此时遮阳伞影子中
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】二次函数
的图象经过
.
(1)试求二次函数表达式(用含有
的式子表示);
(2)已知点
、
,连接
,以
为边在
的右侧作正方形
,若二次函数图象与正方形
的边有公共点,求
的取值范围;
(3)在(2)中,已知直线
,是否存在
,使得直线
与二次函数图象同时经过正方形
(包括内部与边界)?若存在,试求出
的取值范围;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d71b3cb2a27fbe0d69357431c7575f1.png)
(1)试求二次函数表达式(用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5803fbf519a2a86675c75fb135681ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165082a3292d275a565eb59d51600c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)在(2)中,已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b8bca26171ea172183299a74006474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】请用无刻度的直尺作图
(1)在图1中,已知点
是正方形ABCD边
的中点,分别画出BC,CD,DA的中点F,G,H;
(2)图2是正方形
,
是对角线
上任意一点
,以
为边画一个菱形.
![](https://img.xkw.com/dksih/QBM/2019/12/17/2356918694461440/2357602857549824/STEM/4d045a5132b64968bdc9522673ecc1ce.png?resizew=141)
(1)在图1中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)图2是正方形
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a21dd00d9c10d4c52164a8b1dedc27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2019/12/17/2356918694461440/2357602857549824/STEM/4d045a5132b64968bdc9522673ecc1ce.png?resizew=141)
![](https://img.xkw.com/dksih/QBM/2019/12/17/2356918694461440/2357602857549824/STEM/a60211e5a67344aca96dcfdb24d6abf8.png?resizew=129)
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【推荐1】如图,在▱ABCD中,点E是BC边的一点,将边AD延长至点F,使得∠AFC=DEC,连接CF,DE.
(1)求证:四边形DECF是平行四边形;
(2)如果AB=13,DF=14,tan∠DCB=
,求CF的长.
(1)求证:四边形DECF是平行四边形;
(2)如果AB=13,DF=14,tan∠DCB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dcea77b8c23bfca41460d2e622c35d8.png)
![](https://img.xkw.com/dksih/QBM/2019/6/15/2226004778770432/2228008591835136/STEM/a5c97345b3a54464acd62319653d5f5b.png?resizew=221)
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【推荐2】如图,⊙C经过坐标原点,且与两坐标轴分别交于点A与点B,点A的坐标为(0,4),M是圆上一点,∠BMO=120°.
(1)求证:AB为⊙C直径.
(2)求⊙C的半径及圆心C的坐标.
![](https://img.xkw.com/dksih/QBM/2017/10/23/1807819231510528/1831199845982208/STEM/f3e053eb-1ad9-4fe4-90da-65370119752a.png?resizew=263)
(1)求证:AB为⊙C直径.
(2)求⊙C的半径及圆心C的坐标.
![](https://img.xkw.com/dksih/QBM/2017/10/23/1807819231510528/1831199845982208/STEM/f3e053eb-1ad9-4fe4-90da-65370119752a.png?resizew=263)
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