【操作与发现】
如图①,在正方形
中,点N,将
绕点A顺时针旋转
,点D与点B重合,从而可得:
.
,
,则正方形
的边长是___________.
(2)如图②,在正方形
中,点M、N分别在边
、
上,
,若
,求证:M是
的中点.
(3)【拓展】如图③,在矩形
,
,
,点M、N分别在边
、
上,连接
、
,
,则
的长是 ___________.
如图①,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a760864f397a1df8738e9d8af463c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c8599965e62eae0bf34701f1a914a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe14b7ecc401749db077e8965c25d161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ad969adb7466b177d9a9cca2de07a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)【拓展】如图③,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88c5025689144c57cf36d1851ebc026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9abe9e42cf396cf527b4ccbd2fefe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
更新时间:2024-04-11 08:33:24
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相似题推荐
解答题-问答题
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较难
(0.4)
【推荐1】已知在边长为4的菱形ABCD中,∠EBF=∠A=60°,
(1)如图①,当点E、F分别在线段AD、DC上,
①判断△EBF的形状,并说明理由;
②若四边形ABFD的面积为7
,求DE的长;
(2)如图②,当点E、F分别在线段AD、DC的延长线上,BE与DC交于点O,设△BOF的面积为S1,△EOD的面积为S2,则S1-S2的值是否为定值,如果是,请求出定值:如果不是,请说明理由.
(1)如图①,当点E、F分别在线段AD、DC上,
①判断△EBF的形状,并说明理由;
②若四边形ABFD的面积为7
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)如图②,当点E、F分别在线段AD、DC的延长线上,BE与DC交于点O,设△BOF的面积为S1,△EOD的面积为S2,则S1-S2的值是否为定值,如果是,请求出定值:如果不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/13/2418670193442816/2419235374465024/STEM/37d9bbe18c5f4cecae3c57b52fa1ace7.png?resizew=449)
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【推荐2】【发现问题】爱好数学的小明在做作业时碰到这样的一道题目:
如图①,点O为坐标原点,
的半径为1,点
,动点B在
上,连结AB,作等边
B,C为顺时针顺序
,求OC的最大值.
【解决问题】小明经过多次的尝试与探索,终于得到解题思路:在图①中,连接OB,以OB为边在OB的左侧作等边三角形BOE,连接AE.
![](https://img.xkw.com/dksih/QBM/2021/1/20/2640179275292672/2645214664990720/STEM/58fecab612d54aa5888407651109c084.png?resizew=458)
请你找出图中与OC相等的线段,并说明理由;
线段OC的最大值为_____.
【灵活运用】
如图②,在平面直角坐标系中,点A的坐标为
,点B的坐标为
,点P为线段AB外一动点,且
,求线段AM长的最大值及此时点P的坐标.
【迁移拓展】
如图③
,点D是以BC为直径的半圆上不同于B、C的一个动点,以BD为边作等边
,请直接写出AC的最大值,最小值.
如图①,点O为坐标原点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd80ee0b5e585ca267ceeb47d6f8b8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc307c79e471d7bab0bf25bb4883f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
【解决问题】小明经过多次的尝试与探索,终于得到解题思路:在图①中,连接OB,以OB为边在OB的左侧作等边三角形BOE,连接AE.
![](https://img.xkw.com/dksih/QBM/2021/1/20/2640179275292672/2645214664990720/STEM/58fecab612d54aa5888407651109c084.png?resizew=458)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
【灵活运用】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b569572c8d9bf05d78d3ab741e68bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcbaa7910d5886bf92320d644d64ab6.png)
【迁移拓展】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49be5fb800b66cdb284b864e8f04a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed99ce25ed3a5a017f66d974e7421d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af7ec89310dae69a9b978060f523cd5b.png)
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【推荐1】如图,直线y=﹣x+b分别与x轴、y轴交于A,B两点,点A的坐标为(3,0),过点B的另一条直线交x轴负半轴于点C,且OB:OC=3:1.
(1)求点B的坐标及直线BC对应的函数表达式;
(2)在线段OB上存在点P,使得点P到点B,C的距离相等,试求出点P的坐标;
(3)如果在x轴上方存在点D,使得以点A,B,D为顶点的三角形与△ABC全等,请直接写出点D的坐标.
(1)求点B的坐标及直线BC对应的函数表达式;
(2)在线段OB上存在点P,使得点P到点B,C的距离相等,试求出点P的坐标;
(3)如果在x轴上方存在点D,使得以点A,B,D为顶点的三角形与△ABC全等,请直接写出点D的坐标.
![](https://img.xkw.com/dksih/QBM/2019/11/20/2338101824241664/2339394372280320/STEM/085a0a0fc83343508de6a7777f2196bd.png?resizew=193)
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【推荐2】在正方形
中,点M在
上,点N在
的延长线上,且
,连接
,设
交
于点E.
的度数;
(2)如图2,点F为
上一点,连接
交
于点G,且
,求证:
;
(3)如图3,在(2)的条件下,过点M作
交
于点H,若
,且
,求正方形的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d378fea1ac2f8eb93d62aea14c5a6059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe728ee28ea19735a217d0d64cee61a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7098c45594103b46e6b57cfc6023e93.png)
(2)如图2,点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b273d169d213c490e08f5b5d5d7d0646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9da441d03aaaf554fe33d3bf8952331.png)
(3)如图3,在(2)的条件下,过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b178572ce608b1c0f4868b4e45d8b76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7949c19b2028d5ca28cb1a7764c8e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb198ca5e27a01df434abc0c6b93a999.png)
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【推荐1】如图
,在
中
.正方形
的顶点
在边
上,点
在
边上,设
.请根据以上信息解决下列问题:
的代数式表示
的长;
(2)尺规作图:在图
中作正方形
,使点
在
上,点
在
上,点
在
上;
(3)在(
)的条件下,求所作正方形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26012846d906dee88a465898efb0d033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bc55510792f8bd30e1c0686609fe3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
(2)尺规作图:在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c6d2327050e546ce6dcea00de224c8.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
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【推荐2】在正方形
中,
,
,
、
分别在
、
上.(且不与正方形顶点重合)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/056258fb-f5c9-4696-a5f0-9ab016946d4e.png?resizew=425)
(1)如图1,若
,求证:
;
(2)如图2,射线
和
的延长线交于点
,射线
和
的延长线交于点
,连接
,请问
的面积是否发生变化;如果不变,请求出
的面积;如果要变,请说明理由;
(3)如图3,连接
分别交
、
于点
和点
,连接
,则
,过点
作
交
于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/056258fb-f5c9-4696-a5f0-9ab016946d4e.png?resizew=425)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf237e9110eb87a78232fa60d652ae66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562fa4f3ed4299de43e67b50e66d1f43.png)
(2)如图2,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8812c22d03a1ed2f4fd79372adb7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a95166c2be87231e54fbd74294b2776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c07b2e46a011160d21c078d25ec74c.png)
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【推荐1】如图,已知二次函数
的图象交x轴于点
,
,交y轴点A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/a824bc66-0643-453e-8685-ffb8583d4470.png?resizew=188)
(1)求二次函数
的表达式;
(2)连接AC,AB,若点P在线段BC上运动(不与点B,C重合),过点P作PD//AC,交AB于点D,试猜想
的面积有最大值还是最小值,并求出此时点P的坐标.
(3)连接OD,在(2)的条件下,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a89c495be618bca7c4e6af85ba8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a9f4e4a36cc4b41d4818b884cfa895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70b7ee9e3407dea9aed44f2db4104c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/a824bc66-0643-453e-8685-ffb8583d4470.png?resizew=188)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1a89c495be618bca7c4e6af85ba8ec.png)
(2)连接AC,AB,若点P在线段BC上运动(不与点B,C重合),过点P作PD//AC,交AB于点D,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
(3)连接OD,在(2)的条件下,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defb2f1e87246eaaa57acb11c8b731fb.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,抛物线y=ax2+bx+3(a≠0)与x轴交于点A(1,0)和点B(-3,0),与y轴交于点C,连接BC,与抛物线的对称轴交于点E,顶点为点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b9394dd1-93f8-4be2-9702-b8d641bc1b72.png?resizew=394)
(1)求抛物线的解析式;
(2)若M是抛物线上位于线段BC上方的一个动点,求△BCM的面积的最大值;
(3)点P是对称轴左侧抛物线上的一个动点,点Q在射线ED上,若以点P、Q、E为顶点的三角形与△BOC相似,请直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b9394dd1-93f8-4be2-9702-b8d641bc1b72.png?resizew=394)
(1)求抛物线的解析式;
(2)若M是抛物线上位于线段BC上方的一个动点,求△BCM的面积的最大值;
(3)点P是对称轴左侧抛物线上的一个动点,点Q在射线ED上,若以点P、Q、E为顶点的三角形与△BOC相似,请直接写出点P的坐标.
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解答题-作图题
|
较难
(0.4)
【推荐3】如图①,已知平面内一点
与一直线
,如果过点
作直线
,垂足为
,那么垂足
叫做点
在直线
上的射影;如果线段
的两个端点
和
在直线
上的射影分别为点
和
,那么线段
叫做线段
在直线
上的射影.
如图①,已知平面内一点
与一直线
,如果过点
作直线
,垂足为
,那么垂足
叫做点
在直线
上的射影;如果线段
的两个端点
和
在直线
上的射影分别为点
和
,那么线段
叫做线段
在直线
上的射影.
(1)如图②,
、
为线段
外两点,
,
,垂足分别为
、
.
则
点在
上的射影是________点,
点在
上的射影是________点,
线段
在
上的射影是________,线段
在
上的射影是________;
(2)根据射影的概念,说明:直角三角形斜边上的高是两条直角边在斜边上射影的比例中项.(要求:画出图形,写出说理过程.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85a694aaf8341400a20e1a37917e67a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bff7ffe4b2650908f759868ea30898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e5893c700a82b3d2c62711c6b29eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
如图①,已知平面内一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85a694aaf8341400a20e1a37917e67a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60051144e33707f6aa51b2fe09925268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bff7ffe4b2650908f759868ea30898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e5893c700a82b3d2c62711c6b29eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3d0575fe1ffe2aa1e15f999b0f7c03.png)
(1)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53af502b734034347eed265f9cc36d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed79972b657eac4b57754d955ea8f440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)根据射影的概念,说明:直角三角形斜边上的高是两条直角边在斜边上射影的比例中项.(要求:画出图形,写出说理过程.)
![](https://img.xkw.com/dksih/QBM/2018/11/4/2068506818674688/2069725903609856/STEM/4431dcb70cd945f4885940f67a9ef0c1.png?resizew=255)
您最近一年使用:0次