定义:在平面直角坐标系中,把点先向右平移1个单位,再向上平移2个单位的平移称为一次斜平移.已知点A(1,0),点A经过n次斜平移得到点B,点M是线段AB的中点.
(1)当n=3时,点B的坐标是 ,点M的坐标是 ;
(2)如图1,当点M落在
的图像上,求n的值;
(3)如图2,当点M落在直线
上,点C是点B关于直线
的对称点,BC与直线
相交于点N.
①求证:△ABC是直角三角形
②当点C的坐标为(5,3)时,求MN的长.
(1)当n=3时,点B的坐标是 ,点M的坐标是 ;
(2)如图1,当点M落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
(3)如图2,当点M落在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
①求证:△ABC是直角三角形
②当点C的坐标为(5,3)时,求MN的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/60cc0e40-0c7d-43f3-add1-757a396991b7.png?resizew=245)
19-20九年级上·湖南永州·期中 查看更多[4]
湖南省永州市新田县2019-2020学年九年级上学期期中数学试题2020年湖南省长沙市长郡滨江中学中考数学3月模拟试题(已下线)专题43 反比例函数中的直角三角形问题(九年级上重点突破)北师大版山东省初中毕业年级2024年数学模拟预测题
更新时间:2020-03-09 22:10:13
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【推荐1】如图,在平面直角坐标系xOy中,一次函数y1=ax+b(a,b为常数,且a≠0)与反比例函数y2=
(m为常数,且n≠0)的图象交于点A(﹣3,1)、B(1,n).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/d1491943-4015-4324-a559-43feba31ac48.png?resizew=202)
(1)求反比例函数和一次函数的解析式;
(2)连结0A、OB,求△AOB的面积;
(3)直接写出当y1<y2<0时,自变量x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7626c207a4dc82d4d59cb520c91e49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/d1491943-4015-4324-a559-43feba31ac48.png?resizew=202)
(1)求反比例函数和一次函数的解析式;
(2)连结0A、OB,求△AOB的面积;
(3)直接写出当y1<y2<0时,自变量x的取值范围.
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【推荐2】如图,反比例函数
与一次函数
交于A,B两点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/18bea8f9-b654-4510-8465-c42f0b6097ae.png?resizew=151)
(1)求反比例函数和一次函数的解析式;
(2)在第二象限内边长为1的正方形CDEF的边平行于坐标轴,点D的坐标为
,当直线AB与正方形边有公共点时,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa915a60a2d6e535369715ba84015b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe881163c775a56269efb4068399227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34226bd2343494f17ec479295f73284f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11198abc12f15efcf2ed35564cf2024a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/18bea8f9-b654-4510-8465-c42f0b6097ae.png?resizew=151)
(1)求反比例函数和一次函数的解析式;
(2)在第二象限内边长为1的正方形CDEF的边平行于坐标轴,点D的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2833f66078621a005568c811779a5326.png)
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【推荐1】在平面直角坐标系
中,函数
和
的图象关于原点对称.
(1)函数
为
,
的解析式为________;
(2)函数
为
(
),
的解析式为_______;
(3)函数
为
.
①已知
、
,
与线段
有一个交点,求
的取值范围;
②若
,当
时,设函数
的最大值与最小值的差为
,求
关于
的函数解析式;并直接写出自变量
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(3)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31a61567cd13b63c90a9abf3cf9e34.png)
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f94c4f6b762fddb0e313050ef6932eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473cb51e930729ed70b6c60ac011906f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92496203c1eb7f770f6dcccbcc5a1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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真题
【推荐2】已知二次函数图象的顶点坐标为
,且与x轴交于点
.
(2)如图,将二次函数图象绕x轴的正半轴上一点
旋转
,此时点A、B的对应点分别为点C、D.
①连结
,当四边形
为矩形时,求m的值;
②在①的条件下,若点M是直线
上一点,原二次函数图象上是否存在一点Q,使得以点B、C、M、Q为顶点的四边形为平行四边形,若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7086e04471893c3b8e7526692286511f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e30645f36e8628b9e25d53598d5174.png)
(2)如图,将二次函数图象绕x轴的正半轴上一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d903b1ff09e933b73ef0f75fc861dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b589ca985b32e60ea2e39fe58d4ac9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②在①的条件下,若点M是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
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【推荐3】如图,抛物线
上的点
,
,
,
分别关于直线
的对称点为
,
,
,
,分别关于点
中心对称的点为
,
,
,
,如下表:
(1)①补全表格;
②在下图中,描出表格中的点
,
,
,
,再用平滑的曲线依次连接各点得到的图象记为
;描出表格中的点
,
,
,
,再用平滑的曲线依次连接各点,得到的图象记为
.
形成新定义:直线
与
轴交于点
,我们把抛物线
关于直线
的对称抛物线
,叫作抛物线
的“共线抛物线”;把抛物线
关于点
中心对称的抛物线
,叫作抛物线
的“共点抛物线”.
问题探究
(2)①若抛物线
与它的“共点抛物线”
的函数值都随着
的增大而减小,求
的取值范围;
②若直线
与抛物线
、“共线抛物线”
,“共点抛物线”
有且只有四个交点,求
的取值范围.
③已知抛物线
:
的“共线抛物线”
的解析式为
.请写出抛物线
的“共点抛物线”
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515fe5f0286b7f0ef04bab5645b69923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1b6f209d1a805437046ca6ef79dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9362f7a7911429349df9ae90591db47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c578d3a17de6f47abaaeca5ab778e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d5b654328a91c8380c4295c5c56e32.png)
… | ![]() | ![]() | ![]() | ![]() | … |
… | ![]() | ![]() | ![]() | ![]() | … |
![]() | ![]() | ![]() | ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/6a5c0394-b68f-4e90-9005-b0847a945776.png?resizew=269)
(1)①补全表格;
②在下图中,描出表格中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94132e99a6f7294668549b3c3d7a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9362f7a7911429349df9ae90591db47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c578d3a17de6f47abaaeca5ab778e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d5b654328a91c8380c4295c5c56e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
形成新定义:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac8cdda4f66904b6e2676689c40dbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac8cdda4f66904b6e2676689c40dbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
问题探究
(2)①若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
③已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0d202540ca1784cb709e128155c1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b74be067dd537c0c2867451a1f5d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
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名校
【推荐1】已知:如图,在平面直角坐标系中,直线交x轴于点B,交y轴于点C,经过B,C两点的抛物线
交x轴负半轴于点A,
.
(1)求抛物线的解析式;
(2)点P为第一象限内抛物线上一点,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef7eab528a8dd3e3f328de3b3ac80ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
(3)在(2)的条件下,点P关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd17003e590e16b109a7cd5ec1586611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903e73eee7711c79f99fb78a21a93261.png)
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【推荐2】【问题呈现】
如图1,在
中,
,
,
,点P,Q分别是射线
,射线
上的两动点,且满足
,连接
.问:
有何特点?
(1)以下是某中学九年级(4)班同学们的一些猜测,其中正确的是 (填序号);
①运动过程中,
的周长不变;
②运动过程中,
面积不变;
③运动过程中,
的形状不变;
④运动过程中,
的大小不变.
(2)某同学提问:运动过程中,
的值是否发生变化?请你帮忙解惑(若变化,请说明理由;若不变,请你依图1中的位置情形,求出其值).
(3)如图2,点O是
的中点,点M是
的中点,当
最小时,M,O两点间的距离是多少?(可直接写出结果)
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ded1866ae79f8031474ce6723900c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308b3a925100831071bbdc49fcb2460e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
(1)以下是某中学九年级(4)班同学们的一些猜测,其中正确的是 (填序号);
①运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
②运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
③运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
④运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d9f2bee4f93e23c07e0aaeecf02f43.png)
(2)某同学提问:运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6675c2d11a1d7c6f2436fbe0cab94f.png)
(3)如图2,点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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