如图已知一次函数
的图像与坐标轴交于A、B点,点E是线段
上的一个动点(点E不与点O、B重合),过点B作
,垂足为F,联结
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/b1f8dba1-0c0c-4b21-86a7-d4c246f1e510.png?resizew=468)
(1)点B的坐标为___________.
(2)当直线
的表达式为
时,求此时
的面积.
(3)设
,
,试求y关于x的函数关系式,并写出定义域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0c03f142eb32f553465728efc42cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/b1f8dba1-0c0c-4b21-86a7-d4c246f1e510.png?resizew=468)
(1)点B的坐标为___________.
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60ecd5f53b3469726c8cb09e86ff20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3954beda5772eb8d5de1002ddeb81524.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deab30125e09b58dbd451fd2633ff9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b9f48b80427d1ec649873cb6aac731.png)
22-23八年级下·上海浦东新·阶段练习 查看更多[2]
上海市进才中学北校2022-2023学年八年级下学期3月自适应练习数学试题(已下线)专题19.46 一次函数题型分类专题(面积问题)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)
更新时间:2023-03-23 19:45:40
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相似题推荐
解答题-问答题
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名校
【推荐1】如图1,在平面直角坐标系中,直线
:
与
轴交于点
,与
轴交于点
.直线
与
轴交于点
,与
轴交于点
,两直线交于点
,若点
为
的中点,
.
的解析式;
(2)如图2,连接
,点
为直线
上一动点且位于直线
下方,若有
,请求出点
坐标;
(3)如图3,将直线
平移得到直线
,使得直线
经过点
,并交
轴于点
,点
为直线
上一动点,是否存在以点
、
、
为顶点的三角形是等腰三角形?若存在,请写出所有符合条件的点
的坐标,并写出求解点
坐标其中一种情况的过程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eed46a589bde8b7c78a81a8cf9b9a.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5d25dd7a258497441972c975c2badd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)如图3,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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1,在平面直角坐标系中,一次函数
的图象分别交
轴于点
,抛物线
经过点
,点P为第四象限内抛物线上的一个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/75bd1ef7-cd5f-4e63-b90c-6b5ce381dd2f.png?resizew=414)
(1)写出点A、点B的坐标;
(2)求此抛物线对应的函数表达式;
(3)如图2,过点P作PM//y轴,分别交直线
轴于点
,若以点
为顶点的三角形与
相似,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24edd2a1d145627d07330524017daf5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/75bd1ef7-cd5f-4e63-b90c-6b5ce381dd2f.png?resizew=414)
(1)写出点A、点B的坐标;
(2)求此抛物线对应的函数表达式;
(3)如图2,过点P作PM//y轴,分别交直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de7e0c844cd2a822f67eba8bf803063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4693fda5f302558748d1fa9816b3b24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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【推荐1】如图1,已知在平面直角坐标系中,点O为坐标原点,点A在x轴负半轴上,直线y=﹣x+6与x轴、y轴分别交于B、C两点,四边形ABCD为平行四边形,且AC=BC,点P为△ACD内一点,连接AP、BP且∠APB=90°.
(1)求证:∠PAC=∠PBC;
(2)如图2,点E在线段BP上,点F在线段AP上,且AF=BE,∠AEF=45°,求EF2+2AE2的值;
(3)在(2)的条件下,当PE=BE时,求点P的坐标.
(1)求证:∠PAC=∠PBC;
(2)如图2,点E在线段BP上,点F在线段AP上,且AF=BE,∠AEF=45°,求EF2+2AE2的值;
(3)在(2)的条件下,当PE=BE时,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2019/5/24/2210418412445696/2212196780982272/STEM/caededa3826147a79f7842a567cf82a6.png?resizew=499)
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【推荐2】已知一次函数
的图象与坐标轴交于
点(如图),
平分
,交
轴于点
.
(1)求点
的坐标;
(2)求直线
的表达式;
(3)过点
作
,垂足为
,连接
,试判断
的形状,并求
的面积;
(4)若将已知条件“
平分
,交
轴于点
”改变为“点
是线段
上的一个动点(点
不与点
重合)”,过点
作
,垂足为
.设
,试求
与
之间的函数关系式,并写出函数的定义域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0c03f142eb32f553465728efc42cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/0b0281e0-8ea4-4ddc-b44d-cbe1038c0455.png?resizew=452)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff3b4de4a08843340abc16e10bbd3d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff3b4de4a08843340abc16e10bbd3d9.png)
(4)若将已知条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8134c0bf1418693912b362cc71b00d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7c9f4ef36b8c89bb73a6d7f478f501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】如图①,
平分
,
⊥
,∠B=450,∠C=730.
(1) 求
的度数;
(2) 如图②,若把“
⊥
”变成“点F在DA的延长线上,
”,其它条件不变,求
的度数;
(3) 如图③,若把“
⊥
”变成“
平分
”,其它条件不变,
的大小是否变化,并请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1) 求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2) 如图②,若把“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc42287f66ae7c6c569eb8fa5a991e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
(3) 如图③,若把“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/2019/4/18/2185159079976960/2185785317605376/STEM/14cdfecb9d994be288b9089a6368fb9b.png?resizew=477)
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【推荐2】
中,
,过点A作
.连接
,M为平面内一动点.
(1)如图1,若
,则
.
(2)如图2,点M在
上,且
于M,过点A作
于F,D为
中点,连接
并延长,交
于点
;求证:
(3)如图3,连接
,过点B作
于点B,且满足
,连接
,过点B作
于点G,若
,求线段
的长度的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0038fd38bb04187e5cb2d60099c720b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162ce08ead3fc7f199a7ca1616247abd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/b30e7c88-af0d-4729-a0da-44fa5903724d.png?resizew=403)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580da64650ff9a6bddbdc7665ed808d0.png)
(2)如图2,点M在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352152ad232cab3e56569da9c6f18102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86da31bf6d13f2c34c82668bd132ba6.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed99b49a34e373ff55af024bd00fa83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9a9afdf66cf906b9184d4714eeac92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dbe958cf93f2bde1d6abec260f5bde7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2fc18c2f9d9b08a24bb3c50e47ffcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0972f8dc1e2a5720ea7bc57dfd9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae85ab09f876c0d21a07740f95e7250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e10e10052bd862b0323ae961deacb353.png)
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【推荐1】如图1,四边形
是证明勾股定理时用到的一个图形,a,b,c是
和
边长,易知
,这时我们把关于x的形如
的一元二次方程称为“勾系一元二次方程”.
请解决下列问题:
(1)写出一个“勾系一元二次方程”;
(2)求证:关于x的“勾系一元二次方程”
必有实数根;
(3)如图1,若
是“勾系一元二次方程”
的一个根,且四边形
的周长是
,求
面积;
(4)如图2,
的三边分别为a,b,c,
,且
.求证:关于x的一元二次方程
必有实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9104f968a809b596ab39dbcb125ce740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38490237941b52f221e7a301fb56ccb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f97e109bcafdf2d9079cdcd7ec190a.png)
请解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/e67b276f-ec77-43bd-9bbf-00f38803ed58.jpg?resizew=258)
(1)写出一个“勾系一元二次方程”;
(2)求证:关于x的“勾系一元二次方程”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f97e109bcafdf2d9079cdcd7ec190a.png)
(3)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef00713e73b8357cc7900144f5505bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f97e109bcafdf2d9079cdcd7ec190a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec978eb43bc4f9e7df83b0d0195dcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(4)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b3c50fd5788845d1090c9c6a97a90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4fa1381b9da4970c2fa4dd6c10386f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3565d6fc57369c6f429ba6dadd8fcd9d.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知:
的半径为5,点
在直径
上,过点
作
的弦
,过点
作直线
的垂线
,垂足为点
.
时,求线段
的长;
(2)当点
是线段
的中点时,求
的长;
(3)如果
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd8d8afce77ffebd38aeffd4fe62d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次