如图,一次函数的图象经过点A(4,0)和点D(2,1.5),与y轴交于点B,将△AOB沿直线CD对折,使点A与点B重合,直线CD与x轴交于点C,与AB交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/10bd72e1-b5c1-45d5-8621-b05f90928eee.png?resizew=207)
(1)求一次函数解析式;
(2)求DC的长;
(3)点P是x轴上一动点,若△PAB是等腰三角形,直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/10bd72e1-b5c1-45d5-8621-b05f90928eee.png?resizew=207)
(1)求一次函数解析式;
(2)求DC的长;
(3)点P是x轴上一动点,若△PAB是等腰三角形,直接写出点P的坐标.
21-22八年级上·辽宁朝阳·期末 查看更多[4]
辽宁省朝阳市第七中学2021-2022学年八年级上学期期末数学试题(已下线)专题38 一次函数中的等腰三角形-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)(已下线)专题27 一次函数与等腰三角形结合-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(人教版)第26章 一次函数 单元测试卷人教版(五四制)八年级下册数学
更新时间:2022-09-02 12:49:52
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相似题推荐
解答题-问答题
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【推荐1】如图一次函数
(
)的图象与反比例函数
的图象交于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/d231c761-ed1f-4777-b0bf-89fc77231e56.png?resizew=237)
(1)求反比例函数
和一次函数
的解析式;
(2)分别连接AO、BO,求
的面积;
(3)根据函数图象直接写出当一次函数的值大于反比例的值时,x的取值范围.
(4)点P在线段AB上,且
,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d49d34012ddf68fb981eb4975ac99b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a4315ca588d7262591bbb9177aee5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/d231c761-ed1f-4777-b0bf-89fc77231e56.png?resizew=237)
(1)求反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
(2)分别连接AO、BO,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(3)根据函数图象直接写出当一次函数的值大于反比例的值时,x的取值范围.
(4)点P在线段AB上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492db6b96720dec0cf4375e7607a6e1e.png)
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名校
【推荐2】关于函数
:
(1)当
时,
;
(2)当
时,
;
(3)在右图中画出函数
的图象;
(4)由图像可知,在
轴 侧(填左或者右),
随
的增大而减小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b8b283075bf8aa89c4ce4e58dd01d2.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(3)在右图中画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b8b283075bf8aa89c4ce4e58dd01d2.png)
(4)由图像可知,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806758852329472/2810220704874496/STEM/41ffe08a-7b8e-44ba-a286-1a5e1251f1ef.png)
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【推荐1】在平面直角坐标系中有点
,点
,点P是x轴上一动点,在直线
上是否存在点Q,使以A、B、P、Q为顶点的四边形为平行四边形?若存在,求出对应的P、Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f0522f50899484a3bc569b687000dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887d13887d7e80f5acd551b54561bdf5.png)
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【推荐2】如图,在平面直角坐标系中,直线
:
与y轴交于点B,与x轴交于点C,直线
:
与y轴交于点D.直线
和直线
相交于点A,已知A点纵坐标为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/55392f26-46d4-4906-af22-e832657dade2.png?resizew=167)
(1)求点A的横坐标及k的值.
(2)点M在直线
上,
轴,交x轴于点N,若
,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231896d2386c924306fce5ccf9f9e8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/55392f26-46d4-4906-af22-e832657dade2.png?resizew=167)
(1)求点A的横坐标及k的值.
(2)点M在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20f734ac54ab0eec2e1c170a3a24f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b0d7fd08bbb9b7fbb669151cd821e9f.png)
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【推荐3】在舞台上有两根竖直放置的铁杆,其中铁杆AB长1m,CD长2m,两根铁杆之间的距离为3m,现在B、D之间拉起一根钢索,杂技演员在上面表演走钢丝,为了描述演员的位置,小明以A点为坐标原点,建立了如图所示的平面直角坐标系,演员的位置为点M,设其横坐标为x,纵坐标为y.
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573639557881856/1573639593738240/STEM/f2f46bf74a5f43828ff4b648c974d43e.png)
(1)求出线段BD的函数关系式;
(2)为了保护演员的安全,过D点拉了一根与地面平行的钢索DE,在上面挂上了一条保险钢丝MN,MN随演员的移动而移动,并始终垂直于地面,其长度自动调整,设保险钢丝的长度为w,求w与x之间的函数关系式.
![](https://img.xkw.com/dksih/QBM/2013/4/16/1573639557881856/1573639593738240/STEM/f2f46bf74a5f43828ff4b648c974d43e.png)
(1)求出线段BD的函数关系式;
(2)为了保护演员的安全,过D点拉了一根与地面平行的钢索DE,在上面挂上了一条保险钢丝MN,MN随演员的移动而移动,并始终垂直于地面,其长度自动调整,设保险钢丝的长度为w,求w与x之间的函数关系式.
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【推荐1】已知在△ABC中,AD是BC边上的中点,E是AD上的一点,且BE=AC,延长BE交AC于点F,求证:AF=EF
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/098cd4e0-b2b5-4dcd-ac37-826832e57feb.png?resizew=188)
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【推荐2】如图,在
,
,点D是边
上一点(不与点A,C重合),线段
是由线段
绕点A逆时针旋转
得到,连接
.判断直线
与
的位置关系,并说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a339ae1f82e16c449eb43122d07eb15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dd0c52aca1675c17b9a019aa7901e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】在平面直角坐标系中,
为原点.
![](https://img.xkw.com/dksih/QBM/2019/11/5/2327358788313088/2327414557614080/STEM/b347413286724ce1a6e15c48ef1e1fe5.png?resizew=160)
(1)点
的坐标为
,求线段
的长;
(2)点
的坐标为
,点
的坐标为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2019/11/5/2327358788313088/2327414557614080/STEM/b347413286724ce1a6e15c48ef1e1fe5.png?resizew=160)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97fe88412da03cc114f2250593293217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86022205a7487439dd8d0897cd3bf19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ebed6dde43b2739701f1c7195627b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】在学习了平面直角坐标系后,小明同学在网上搜索到下面的文字材料:
①在
轴上有两点坐标分别为
和
,则这两个点所成的线段的长为
;
②在
轴上的两点坐标分别为
和
,则这两个点所成的线段的长为
.
③如图1,在直角坐标系中的任意两点
,其坐标分别为
和
,分别过这两个点作两坐标轴的平行线,构成一个直角三角形,其中直角边
,
,利用勾股定理可得,线段
.
根据上面材料,回答下面的问题:
(1)在平面直角坐标系中,已知
,
,则线段
的长为 ;
(2)在平面直角坐标系中,已知
,
,则线段
的长为 ;
(3)若点
在
轴上,点
的坐标是
,且
,则点
的坐标是 ;
(4)如图2,在直角坐标系中,点
的坐标分别为
和
,点
是
轴上的一个动点,且
三点不在同一条直线上,求
的最小值.
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345e61f024bf07329cd27dc0bfadcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38b900784cc8995560ef52c3e978c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7815ff9ec9218d3e0811b3c7f15afe7c.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ba819698caf577d2d2d4c598c0f50a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb3442c6bc3aa7fd3af85cd93a38488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38503bb56e68ceff68abdd85f4c3a63f.png)
③如图1,在直角坐标系中的任意两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7677fad27034a7220e207d434cefffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472630cb9d24294eb39f2a08a63b3537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc0527d1c779b028e0b6cf9c81e344f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d410e858d43ca45105d9fc31a1f8fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e178c0a82af0a3bc4db3984a302122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c38c5d4cd7e5b787250499bc00a194.png)
根据上面材料,回答下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/4/24a28013-0c7e-4565-94ce-ce26a7b846fd.png?resizew=312)
(1)在平面直角坐标系中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ecf4767367f8820ab0898057f0fae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d2c191b755e6ff62e48fc8e81260819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在平面直角坐标系中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3689717355455ca99779e57bdb43ccbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650da7007b94790f447d22893ec56aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7267f12d61e2e4c373e1407c05d3610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(4)如图2,在直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58d99ee4f2d7d8071c2e93eeadf9734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ac55c5a8ad17e77e16e842af460186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab15f71acf24a48b4ea4efac5f09b718.png)
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