阅读材料,在平面直角坐标系中,已知x轴上两点
、
的距离记作
,如果
、
是平面上任意两点,我们可以通过构造直角三角形来求
间的距离.如下左图,过A、B分别向x轴、y轴作垂线
、
和
、
,垂足分别是
、
、
、
,直线
交
于点Q,在
中,
,
,∴
.
、
间的距离公式为:
______.
(2)直接应用平面内两点间距离公式计算点
,
之间的距离为______.
利用上面公式解决下列问题:
(3)在平面直角坐标系中的两点
,
,P为x轴上任一点,求
的最小值和此时点P的坐标;
(4)应用平面内两点间的距离公式,求代数式
的最小值(直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ec3d75e53b990bc8f9a4622928dd21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b583230a32b774445332490c511989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/069bb44fbb7edf703239389f12a12227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f04317579e1fc1a24bf3c34d58ffb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0852ff457f599380f91d54fae0dcb129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066325d589416ea109908b052bda9ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5793d04e75460639464da69dccf47057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5815cc29f60d2aa538c4dd30e0803a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0852ff457f599380f91d54fae0dcb129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066325d589416ea109908b052bda9ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3131ba6b7617e178db2d1a81b7feba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1164395178122501e07ed5841cecbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341058118828daf01776611c0aced544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c8e9975098380ef96710b2c94486fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)直接应用平面内两点间距离公式计算点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e81c0221a07e63b83933a5a15d6f2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1657d4cc1ba84a620ac9f0336a99df1.png)
利用上面公式解决下列问题:
(3)在平面直角坐标系中的两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc878a5fd7b508cf817cbb65d3940547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d598b53ebe67b3576315001138268eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
(4)应用平面内两点间的距离公式,求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127d94ad1c95b71c7df53ef085af3f30.png)
22-23八年级上·江苏盐城·期末 查看更多[9]
江苏省盐城市大丰区2022-2023学年八年级上学期期末数学试题(已下线)期末模拟卷(1)-【单元测试】2022-2023学年八年级数学下册分层训练AB卷(湘教版)江苏省盐城市大丰区2022-2023学年八年级下学期开学考试数学试题(已下线)专题3.6 勾股定理章末八大题型总结(培优篇)-2023-2024学年八年级数学上册举一反三系列(苏科版)(已下线)专题1.6 勾股定理章末八大题型总结(培优篇)-2023-2024学年八年级数学上册举一反三系列(北师大版)(已下线)专题2.14 特殊三角形章末十八大题型总结(培优篇)-2023-2024学年八年级数学上册举一反三系列(浙教版)(已下线)专题10解答压轴题(精选真题60道)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(苏科版)(已下线)专题14.6 勾股定理章末八大题型总结(培优篇)-2023-2024学年八年级数学上册举一反三系列(华东师大版)(已下线)第五章 生活的轴对称达标测试卷-2023-2024学年七年级数学下册《知识解读·题型专练》(北师大版)
更新时间:2023-03-19 21:05:09
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】已知同一平面内的具有公共顶点
的矩形
和矩形
,且
,
,连接
.
(1)当点
是矩形
边
延长线上的一点时,延长
交
于点
.
①如图1,若
,猜想线段
与
之间的数量关系是______;
②如图2,若
为任意实数,则①中的猜想是否仍然成立?若成立,请给予证明;若不成立,请说明理由;
(2)当点
是平面内任意一点时,取
的中点
,如图
所示,连接
,
.若
,
,
,请求出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b173a10a2b90f72b81fa8068c131c748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d50f8b5d3bccabe3e10c4439c17974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/7a2bf0d5-a6c7-4913-a47c-96b6b81357a6.png?resizew=487)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5634a208294350f8ec151cd19b6d3278.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
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【推荐2】观察下列每对数在数轴上的对应点间的距离,3与5,4与
,
与3,
与
.并回答下列各题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/ddbd2ae0-8c91-41cb-85ea-38aad43a75a5.png?resizew=319)
(1)数轴上表示4和
两点间的距离是 ,表示
和
两点间的距离是 ;
(2)若数轴上的点
表示的数为
,点
表示的数为
.
①数轴上
、
两点间的距离可以表示为 (用含
的代数式表示);
②如果数轴上
、
两点间的距离为
,求
的值.
(3)直接写出代数式
的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/ddbd2ae0-8c91-41cb-85ea-38aad43a75a5.png?resizew=319)
(1)数轴上表示4和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
(2)若数轴上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
①数轴上
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
②如果数轴上
![](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/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)直接写出代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c1354bc3fa247c93df657b277958bc.png)
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【推荐1】如图,在平面直角坐标系中,
为等腰直角三角形,
,
,点
的坐标为
.
的坐标;
(2)如图,在
轴上找一点
,使得
的值最小,并写出点
的坐标;
(3)在第四象限是否存在一点
,使得以点
,
,
为顶点的三角形是等腰直角三角形,若存在,请直接写出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/410aad8f4e564c85102f18040d68b93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图,在
![](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/a13ec9a812274ad0839f20ba17348687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在第四象限是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图,直线
与
轴交于A点,与反比例函数
的图象交于点M,过M作MH⊥
轴于点H,且tan∠AHO=2.
(1)求
的值;
(2)在
轴上是否存在点P,使以点P、A、H、M为顶点的四边形是平行四边形?如果存在,直接写出P点坐标;如果不存在,请说明理由.
(3)点N(
,1)是反比例函数
图象上的点,在x轴上有一点P,使得PM+PN最小,请求出点P的坐标.
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/cdf6e3366dbe4d6e8898e5df78b769c8.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/885d41257c684b91a023abc67fa15326.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/97e31804586d4cf78829da7ecee09d66.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/7c44d951545d4cbf8ae4d192ef21a7cf.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/7ad55de80c5a4845961c19b44890bb14.png)
(2)在
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/885d41257c684b91a023abc67fa15326.png)
(3)点N(
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/6110428fe7514990bd233e07e7964d69.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/97e31804586d4cf78829da7ecee09d66.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1574233268355072/1574233274859520/STEM/f4b3469067754e97882a89afa888f726.png)
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名校
【推荐3】古罗马时代,亚历山大有一个著名的学者叫海伦,一天罗马的一位将军专程跑去问海伦这样一个问题:每天从军营A出发,先到河边给马喝水,然后再去河岸同侧的B地开会,应该怎样走才能使路程最短?海伦思考后便给出了答案,也就是现在著名的“将军饮马”问题.其实“将军饮马”实质要解决的问题是:要在直线
上找一点P使得
的值最小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d0441d5f-7442-44b0-99c5-a66bdc0dc3f9.png?resizew=517)
(1)如图1,点A到直线
的距离
,点B到直线
的距离
,
,要解决该最小值问题,如图2,作点A关于直线
的对称点
,连接
交直线
于点P,此时P即为所求点,则
的最小值为______;
(2)如图3,在等腰
中,
,
,D是
边的中点,E是
边上一动点,则
的最小值是______;
(3)如图4,正方形
的边长是6,点E是
边上一动点,连接
,过点A作
于点F,点P是
边上另一动点,则
的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d0441d5f-7442-44b0-99c5-a66bdc0dc3f9.png?resizew=517)
(1)如图1,点A到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd038f23f3f52f89654921ac39cbf944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb5b7b443ce3d4d9e98c7905f2bb79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbf49977b753e293bdf415fccd91abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
(2)如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46de792a9388bc13e70dc28eeab60405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04dbd7ca39c0d2c5e29e9f5996f284e.png)
(3)如图4,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fd54871b1d63eab35ec96a031cfb69.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图1,在平面直角坐标系中,抛物线y=ax2+bx+3(a≠0)与x轴分别交于A(﹣3,0),B两点,与y轴交于点C,抛物线的顶点E(﹣1,4),对称轴交x轴于点F.
![](https://img.xkw.com/dksih/QBM/2020/2/1/2389459167428608/2389598476926976/STEM/b7e7f6e1eda34d9ba6506e12ae135408.png?resizew=493)
(1)请直接写出这条抛物线和直线AE、直线AC的解析式;
(2)连接AC、AE、CE,判断△ACE的形状,并说明理由;
(3)如图2,点D是抛物线上一动点,它的横坐标为m,且﹣3<m<﹣1,过点D作DK⊥x轴于点K,DK分别交线段AE、AC于点G、H.在点D的运动过程中,
①DG、GH、HK这三条线段能否相等?若相等,请求出点D的坐标;若不相等,请说明理由;
②在①的条件下,判断CG与AE的数量关系,并直接写出结论.
![](https://img.xkw.com/dksih/QBM/2020/2/1/2389459167428608/2389598476926976/STEM/b7e7f6e1eda34d9ba6506e12ae135408.png?resizew=493)
(1)请直接写出这条抛物线和直线AE、直线AC的解析式;
(2)连接AC、AE、CE,判断△ACE的形状,并说明理由;
(3)如图2,点D是抛物线上一动点,它的横坐标为m,且﹣3<m<﹣1,过点D作DK⊥x轴于点K,DK分别交线段AE、AC于点G、H.在点D的运动过程中,
①DG、GH、HK这三条线段能否相等?若相等,请求出点D的坐标;若不相等,请说明理由;
②在①的条件下,判断CG与AE的数量关系,并直接写出结论.
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解答题-作图题
|
较难
(0.4)
真题
【推荐2】小华同学学习函数知识后,对函数
通过列表、描点、连线,画出了如图1所示的图象.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/11d2895e-44db-41eb-ada3-676accecb4b8.png?resizew=478)
请根据图象解答:
(1)【观察发现】①写出函数的两条性质:______;______;②若函数图象上的两点
,
满足
,则
一定成立吗?______.(填“一定”或“不一定”)
(2)【延伸探究】如图2,将过
,
两点的直线向下平移n个单位长度后,得到直线l与函数
的图象交于点P,连接PA,PB.
①求当n=3时,直线l的解析式和△PAB的面积;
②直接用含 n的代数式表示 △PAB的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa359ebff8f5aa8310b3067deaad87f3.png)
x | … | -4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 | … | |||
y | … | 1 | 2 | 4 | 1 | 0 | -4 | -2 | -1 | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/11d2895e-44db-41eb-ada3-676accecb4b8.png?resizew=478)
请根据图象解答:
(1)【观察发现】①写出函数的两条性质:______;______;②若函数图象上的两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56720e2f2b0ddd72156da495923698da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2852ae85cfcc804b3192ea8543c88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e41c64ac5508a9ba27b697122d6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af264166c2e807ff3cba297019106ae4.png)
(2)【延伸探究】如图2,将过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3305ac6ef7117a61b3ed9fffb03030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb28194b2e3fde6d395a61e677bc7161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a4318545898d9b932e0dbd0afbc7a9.png)
①求当n=3时,直线l的解析式和△PAB的面积;
②
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