如图,已知点A(1,-2)在反比例函数y=
的图象上,直线y=-x+1与反比例函数y=
的图象的交点为点B、D.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610393113927680/2613843734134784/STEM/4886b73e-0fbb-4857-afbc-c4ee57872607.png?resizew=259)
(1)求反比例函数和直线AB的表达式;
(2)求S△AOB;
(3)动点P(x,0)在x轴上运动,若△OAP是等腰三角形时,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2610393113927680/2613843734134784/STEM/4886b73e-0fbb-4857-afbc-c4ee57872607.png?resizew=259)
(1)求反比例函数和直线AB的表达式;
(2)求S△AOB;
(3)动点P(x,0)在x轴上运动,若△OAP是等腰三角形时,直接写出点P的坐标.
20-21九年级上·山东济南·期中 查看更多[3]
山东省济南市章丘区实验中学2020-2021学年九年级上学期期中数学试题山东省泰安市宁阳县实验中学2020-2021学年九年级上学期期末数学试题(已下线)专题04 反比例函数中的等腰三角形-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(人教版)
更新时间:2020-12-14 09:01:36
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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,在同一直角坐标系中,正比例函数的图象可以看作是:将
轴所在的直线绕着原点O逆时针旋转α度角后的图形.若它与反比例函数
的图象分别交于第一、三象限的点B、D,已知点A(-m,0)、C(m,0).
![](https://img.xkw.com/dksih/QBM/2015/10/10/1573919912075264/1573919918022656/STEM/bfb82a5ec8264d4aad335b9b675b9b4d.png)
(1)直接判断并填写:不论α取何值,四边形ABCD的形状一定是 ;
(2)①当点B为(p,1)时,四边形ABCD是矩形,试求p和m有值;
②观察猜想:对①中的m值,直接写出能使四边形ABCD为矩形的点B坐标.
(3)试探究:四边形ABCD能不能是菱形?若能, 直接写出B点的坐标, 若不能,说明理由.
![](https://img.xkw.com/dksih/QBM/2015/10/10/1573919912075264/1573919918022656/STEM/449c5ab2d83d4fed9f84a9c4e45e84c4.png)
![](https://img.xkw.com/dksih/QBM/2015/10/10/1573919912075264/1573919918022656/STEM/bb32ab34b95547d9b07eb03e62cd1bc2.png)
![](https://img.xkw.com/dksih/QBM/2015/10/10/1573919912075264/1573919918022656/STEM/bfb82a5ec8264d4aad335b9b675b9b4d.png)
(1)直接判断并填写:不论α取何值,四边形ABCD的形状一定是 ;
(2)①当点B为(p,1)时,四边形ABCD是矩形,试求p和m有值;
②观察猜想:对①中的m值,直接写出能使四边形ABCD为矩形的点B坐标.
(3)试探究:四边形ABCD能不能是菱形?若能, 直接写出B点的坐标, 若不能,说明理由.
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【推荐2】如图,在平面直角坐标系
中,已知
、
是反比例函数
的图像上的两点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/dcffd758-9e05-48ea-8206-573c0bedbe44.png?resizew=118)
(1)求反比例函数的解析式;
(2)线段
的垂直平分线交
轴于点
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bdb3dac5792ec5fa1ce3f6e7561534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49753619c62e49d6375aa8a7059cbd09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/dcffd758-9e05-48ea-8206-573c0bedbe44.png?resizew=118)
(1)求反比例函数的解析式;
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,点M是反比例函数
图像上的一个动点,过点M作x轴的平行线交反比例函数
图像于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/9bf29b6e-3bc5-4e75-a303-84c66f47275d.png?resizew=241)
(1)若点M(
,3),求点N的坐标;
(2)若点P是x轴上的任意一点,那么△PMN的面积是否发生变化?若不变,求出它的面积是多少?若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834136f6fb1489c13f6f626e0b2ed58d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3b74a91f3fd5961c7a9745b6e68c58.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/9bf29b6e-3bc5-4e75-a303-84c66f47275d.png?resizew=241)
(1)若点M(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa585b9257ed0798213a9ae9b87d291.png)
(2)若点P是x轴上的任意一点,那么△PMN的面积是否发生变化?若不变,求出它的面积是多少?若变化,请说明理由.
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【推荐2】如图,在反比例函数的图象上有不重合的两点
、
,且
点的坐标是
,
点的横坐标为
,
和
都垂直于
轴,垂足分别为
和
.
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075628765413376/2076603952463872/STEM/92a853553b05428c88677c2608c13389.png?resizew=122)
求
点纵坐标;
求
.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a2e7065965eb645a21698f599a0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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名校
【推荐1】如图,已知
是等腰直角三角形,其中
,
,点
为
上任意一点,过点
作
于点
,连接
,取
的中点
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/74222e5d-3412-49ad-959a-7f5b1383f2c9.png?resizew=183)
(1)求证:①
;
②
为等腰直角三角形;
(2)若
,
,试求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/74222e5d-3412-49ad-959a-7f5b1383f2c9.png?resizew=183)
(1)求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e956d1c7bb0f182789919a25f32fc6b4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb6772cca18f6f1cfb7c961a425c8b2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
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【推荐2】把
和
按如图
摆放(点
与
重合),点
、
、
在同一条直线上.已知:
,
,
,
,
.如图
,
从图
的位置出发,以
的速度沿
向
匀速移动,在
移动的同时,点
从
的顶点
出发,以
的速度沿
向点
匀速移动;当点
移动到点
时,点
停止移动,
也随之停止移动.
与
交于点
,连接
,设移动时间为
.
![](https://img.xkw.com/dksih/QBM/2018/11/15/2076233600966656/2077257380143104/STEM/5b41c4f5248746248c47b8ef8da77006.png?resizew=261)
用含
的代数式表示线段
和
的长,并写出
的取值范围;
当
为何值时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15f78219b765745ee6fe37e86a8bff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc04a9c54861c1bec3143db550a53b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1232253611dd38503ba77473eff958.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d610cdac2105a6389aac2105514e7a.png)
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