【感知】
如图1,已知反比例函数
上有两点
,
,
轴交x轴于点E,
轴交y轴于点F,则
______;
_______;
与
的位置关系:_______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/5ede167f-5ea0-42af-8142-970eae84c415.png?resizew=249)
【探究】
数学社团的同学们对上述问题又时行了思考,如图2,当A,B是双曲线
同一支上任意两点,过A,B分别向y轴,x轴作垂线,交y轴于点E,交x轴于点F,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/772e086a-a6d4-44d8-855c-63af1cc6038e.png?resizew=249)
①试探究
与
面积的关系并说明理由.
②试探究
与
之间的位置关系并说明理由.
【运用】
如图3,已知点A、B在反比例函数
的图像上,且
,B是反比例函数
第三象限内图像上的一动点,过点A作
轴,过点B作
轴,垂足分别分为E,F,若四边形
的面积为20,求点B的坐标.(提示,可直接运用上述所发现的结论,答案见公众号:绿爱生活)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/d2586124-40f7-4237-a101-7793257d57e3.png?resizew=210)
【拓展】
如图4,函数
的图像与过原点O的直线相交于B、D两点,点A是第一象限内图像上的动点(点A在点B的左侧),直线
分别交于y轴、x轴于点C、E,连接
分别交y轴、x轴于点M、N.若
,则
______.
如图1,已知反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4212e0f2da912518e8b02a741cc91ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b96726374e05330dd8e2abd924b4058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8178c63d125ee6235feeb2fc70d02745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d7feb7cd0d8c8a1e4c8fb10ac9f919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a635c456b235b771dcec05665a49994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50b8b8bcbb4eee157a421612ef4947f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/5ede167f-5ea0-42af-8142-970eae84c415.png?resizew=249)
【探究】
数学社团的同学们对上述问题又时行了思考,如图2,当A,B是双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/772e086a-a6d4-44d8-855c-63af1cc6038e.png?resizew=249)
①试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
②试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【运用】
如图3,已知点A、B在反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3080b9d9aaace24823a0fd8eb469e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b431187c37d6d5edfbdb458668fb9d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3080b9d9aaace24823a0fd8eb469e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8178c63d125ee6235feeb2fc70d02745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d7feb7cd0d8c8a1e4c8fb10ac9f919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/d2586124-40f7-4237-a101-7793257d57e3.png?resizew=210)
【拓展】
如图4,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6c335ce6d93ec0eba323f43412b5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c446968bfc177f1c9ff7660ac0b746.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/d62f114b-be2c-4efe-9916-dd0ae78edad9.png?resizew=249)
21-22八年级下·江苏盐城·阶段练习 查看更多[3]
江苏省盐城市射阳县盐城中学新洋分校2021-2022学年八年级下学期5月月考数学试题(已下线)专题6.25 反比例函数与图形相似综合(培优篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)九年级数学期末模拟卷(辽宁专用,北师大版九上)-学易金卷:2023-2024学年初中上学期期末模拟考试
更新时间:2022-10-08 10:23:51
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,点
在反比例函数
的图象上,点
在反比例函数
的图象上,矩形
与坐标轴的交点分别为
,
,
,
,
轴,连接
,
,分别交坐标轴于点
,
,连接
.
(1)求证:
为定值;
(2)若
为
的中点,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426ffd700f4b1edf2c05446ca065df05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f478f025292bf27b3442446b77543612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239c11cffa8827f7a26cf28fa27581bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bcab9208983571a636142126725d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/411461db15ee8086332c531e086c40c7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75a108f833dc5ae221afc94b8f7daa1.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712624144834560/2741491203153920/STEM/f6fbc8a1-f275-4023-a1c9-5350d59057e5.png?resizew=353)
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较难
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【推荐2】如图,四边形
的四个顶点分别在反比例函数
与
(
,
)的图象上,对角线
轴,且
于点
,已知点
的横坐标为4.
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504180629585920/2504331421032448/STEM/20b7715b52d74f628079635f05dcd702.png?resizew=246)
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504180629585920/2504331421032448/STEM/0e446f6d77164c7781223a53decdc329.png?resizew=241)
(1)当
,
时.
①若点
的纵坐标为2,求直线
的函数表达式.
②若点
是
的中点,试判断四边形
的形状,并说明理由.
(2)四边形
能否成为正方形?若能,求此时
、
之间的数量关系:若不能,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bde98b608331387ffbfaab1845cb662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a0a547c81fe36ab8c3ea79622ce7ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7e3a1dae520e2075a38181541c90cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504180629585920/2504331421032448/STEM/20b7715b52d74f628079635f05dcd702.png?resizew=246)
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504180629585920/2504331421032448/STEM/0e446f6d77164c7781223a53decdc329.png?resizew=241)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084d365cc7ff8f3bd2db97ee45b1db17.png)
①若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-问答题
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【推荐1】如图,抛物线
与x轴相交的于A,B两点(点A在点B的左侧),与y轴相交于点C,顶点为D.
(2)连接
,与抛物线的对称轴交于点E,点P为线段
上的一个动点(P不与C,B两点重合),过点P作
交抛物线于点F,设点P的横坐标为m.
①用含m的代数式表示线段
的长,并求出当m为何值时,四边形
为平行四边形.
②设
的面积为S,求S与m的函数关系式;当m为何值时,S有最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888dba2f98164a28cb896d3554a311a0.png)
①用含m的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e488c00f4ef96956e2a7a1fdbded624.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
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解题方法
【推荐2】已知函数y1=2kx+k与函数
,定义新函数y=y2﹣y1
(1)若k=2,则新函数y= ;
(2)若新函数y的解析式为y=x2+bx﹣2,则k= ,b= ;
(3)设新函数y顶点为(m,n).
①当k为何值时,n有大值,并求出最大值;
②求n与m的函数解析式;
(4)请你探究:函数y1与新函数y分别经过定点B,A,函数
的顶点为C,新函数y上存在一点D,使得以点A,B,C,D为顶点的四边形为平行四边形时,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241780209875849492e4bad928fd7c70.png)
(1)若k=2,则新函数y= ;
(2)若新函数y的解析式为y=x2+bx﹣2,则k= ,b= ;
(3)设新函数y顶点为(m,n).
①当k为何值时,n有大值,并求出最大值;
②求n与m的函数解析式;
(4)请你探究:函数y1与新函数y分别经过定点B,A,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241780209875849492e4bad928fd7c70.png)
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名校
【推荐1】如图,在平面直角坐标系中,抛物线
与x轴交于
,
,与y轴交于点C,连接
,D为抛物线的顶点.
(2)点P为直线
下方抛物线上的一动点,过P作
于点E,过P作
轴于点F,交直线
于点G,求
的最大值,以及此时点P的坐标;
(3)将抛物线
沿射线
方向平移,平移后的图象经过点
,点M为D的对应点,平移后的抛物线与y轴交于点N,点Q为平移后的抛物线对称轴上的一点,且点Q在第一象限.在平面直角坐标系中确定点R,使得以点M,N,Q,R为顶点的四边形为菱形,请写出所有符合条件的点R的坐标,并写出求解点R的坐标的其中一种情况的过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6711f23c2900c7b00a833bf21edb23d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b1da9046b4cb82135a4a1eaa528c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ba4e84cae5265610fdd846ecbe370f.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd3575240686ea2989331ef4ec9bc4e.png)
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真题
【推荐2】根据相似多边形的定义,我们把四个角分别相等,四条边成比例的两个凸四边形叫做相似四边形.相似四边形对应边的比叫做相似比.
(1)某同学在探究相似四边形的判定时,得到如下三个命题,请判断它们是否正确(直接在横线上填写“真”或“假”).
①条边成比例的两个凸四边形相似;( 命题)
②三个角分别相等的两个凸四边形相似;( 命题)
③两个大小不同的正方形相似.( 命题)
(2)如图1,在四边形ABCD和四边形A1B1C1D1中,∠ABC=∠A1B1C1,∠BCD=∠B1C1D1,
,求证:四边形ABCD与四边形A1B1C1D1相似.
(3)如图2,四边形ABCD中,AB∥CD,AC与BD相交于点O,过点O作EF∥AB分别交AD,BC于点E,F.记四边形ABFE的面积为S1,四边形EFDE的面积为S2,若四边形ABFE与四边形EFCD相似,求
的值.
(1)某同学在探究相似四边形的判定时,得到如下三个命题,请判断它们是否正确(直接在横线上填写“真”或“假”).
①条边成比例的两个凸四边形相似;( 命题)
②三个角分别相等的两个凸四边形相似;( 命题)
③两个大小不同的正方形相似.( 命题)
(2)如图1,在四边形ABCD和四边形A1B1C1D1中,∠ABC=∠A1B1C1,∠BCD=∠B1C1D1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2eacada1b71549c09a2dc12ea25f71f.png)
![](https://img.xkw.com/dksih/QBM/2019/7/18/2249564195569664/2250443429429248/STEM/04df74b0f90245beb495ae6ae6b375f7.png?resizew=429)
(3)如图2,四边形ABCD中,AB∥CD,AC与BD相交于点O,过点O作EF∥AB分别交AD,BC于点E,F.记四边形ABFE的面积为S1,四边形EFDE的面积为S2,若四边形ABFE与四边形EFCD相似,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad5a9147b25285124851a61c7d1a24a.png)
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