菱形
的对角线交于点
.
的顶点
作
于点
,交
于点
,若
,求四边形
的面积;
(2)如图2,过菱形
的顶点
作
,且
,线段
交
于点
,交
于点
,若
、
、
三点共线,求证:
;
(3)如图3,菱形
中,
,
,点
为射线
上一动点,连接
,将
绕点
逆时针旋转
到
,连接
,直接写出线段
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca5accc7df8598f68d2d6cb50f79a7.png)
(2)如图2,过菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4e363bfd418579e6229230df034bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fba21c8237b4cefec6e226dab7234b.png)
(3)如图3,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0434c0177ca5c88ec129bd4cc13f4a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
21-22八年级下·重庆·阶段练习 查看更多[2]
更新时间:2022-03-21 13:58:31
|
相似题推荐
解答题-证明题
|
困难
(0.15)
名校
解题方法
【推荐1】
内接于
,点
在
边上,射线
交
于点
,点
在弧
上,连接
,
.
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804515822927872/2805677480525824/STEM/262b7e37-170c-44ac-aade-9c66fa69b237.png?resizew=525)
(1)如图1,求证:
;
(2)如图2,
交弦
于点
,
经过
点,
,求证:
;
(3)如图3,在(2)的条件下,
为
的中点,连接
、
,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15b31d126f9bec2575f76b3cc0e0d97.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804515822927872/2805677480525824/STEM/262b7e37-170c-44ac-aade-9c66fa69b237.png?resizew=525)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b9cd98beedb827824a89814b774d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/470e28f3c9b10288fe5a9016cdc7fc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658cc8f7aaee6466c626eb1ae444848c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】综合与实践
问题解决:
如图1,已知正方形
,
,把含
(
)的直角三角板的一个锐角顶点和点
重合,三角板和正方形的
,
两边分别相交于
,
两点.
(1)当
时,求
的长;
探究发现:
(2)在图1的基础上,试探究
,
,
有怎样的数量关系,请写出猜想,并给予证明.
类比延伸:
(3)如图2,若三角板和正方形
,
两边的延长线分别相交于
,
两点,请直接写出
,
,
存在的数量关系.
问题解决:
如图1,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565ba0be190605291b1d7d809483eef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
探究发现:
(2)在图1的基础上,试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
类比延伸:
(3)如图2,若三角板和正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/aa478ca9-bf9a-4bdc-84c3-602a5f3ac9c3.png?resizew=416)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】在△ABC中,90°<∠BAC<120°,将线段AB绕点A逆时针旋转120°得到线段AD,连接CD.
![](https://img.xkw.com/dksih/QBM/2022/7/28/3032208940597248/3042130312978432/STEM/87b0f2007f8b4bae926faadeea3c20ae.png?resizew=550)
(1)如图1,若AB=8,∠ABC=45°,BA⊥CD,延长BA,CD交于点K,求四边形ABCD的面积;
(2)如图2,点E是CA延长线上一点,点G是AE的中点,连接BE,BG,点F在线段AC上,点H在线段BG上,连接HF,若BG=GF,HF=BE,GA=GH,2∠ACB=∠EBG+∠ABC,求证:BC+CD=
AC;
(3)如图3,在(1)的条件下,点P是线段BC上的一个动点,连接DP,将线段DP绕点D逆时针旋转45°得到线段DP',连接AP',BP',点M是△ABP'内任意一点,点P在运动过程中,AM+BM+P'M是否存在最小值;若存在,请直接写出:AM+BM+P'M的最小值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/7/28/3032208940597248/3042130312978432/STEM/87b0f2007f8b4bae926faadeea3c20ae.png?resizew=550)
(1)如图1,若AB=8,∠ABC=45°,BA⊥CD,延长BA,CD交于点K,求四边形ABCD的面积;
(2)如图2,点E是CA延长线上一点,点G是AE的中点,连接BE,BG,点F在线段AC上,点H在线段BG上,连接HF,若BG=GF,HF=BE,GA=GH,2∠ACB=∠EBG+∠ABC,求证:BC+CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)如图3,在(1)的条件下,点P是线段BC上的一个动点,连接DP,将线段DP绕点D逆时针旋转45°得到线段DP',连接AP',BP',点M是△ABP'内任意一点,点P在运动过程中,AM+BM+P'M是否存在最小值;若存在,请直接写出:AM+BM+P'M的最小值;若不存在,请说明理由.
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于
两点(
在
的左侧),与
轴交于点
,连接
,过点
作
的平行线交抛物线于点
,交抛物线的对称轴于点
.
为直线
上方的抛物线的图象上一点,当
面积最大时,在直线
上有一个动点M,在直线
上有一个动点N,且
,求
的最小值及此时
点的坐标;
(2)如图2,将
绕点O顺时针旋转至
的位置,点B、C的对应点分别为
、
,且
,
与
轴交于点R,点S是抛物线对称轴上的一个动点,将
沿直线
翻折为
,则
能否为等腰三角形?若能,请直接写出所有符合条件的点S的坐标;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670f76ab7a0c6e48b6419954535b1901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810e5c85b802eb0832513a43f9ed12a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f746310799dace08e9cb13afaf721e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9f7578487b371009a67a86db9bc676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea7250b555cef87fa1dfd50f8cd1f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2711041a99e575846a5262b054065b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a089f8d6dba6056cf5b9cdce13e4829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98623a83a586192ec99b4cececee668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684f222984379f4ccd5c23bcac06c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c229db59652f4d193a2ce65a241d2d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f21f6539707611d345b0251b6f44b8.png)
您最近一年使用:0次
【推荐3】阅读理解:如果一个直角与一条折线相交形成一个封闭图形,那么这条折线在封闭图形上的部分就称为这个角的“补美边”. 例如:图1中∠QPK=90°,它与折线MNGH形成的“补美边”有三条,分别是线段MN、NG和GH.
解决问题:(1)如图2,∠QPK与矩形ABCD形成“补美边”,点P在边AD上且AP=2.若已知矩形ABCD中AB=4,AD=8.分别记∠QPK的两边PQ和PK交矩形的边于点E和点F,设∠APE=
,0≤
≤90°.
①若
=30°,求∠QPK “补美边”的所有边长之和;
②若∠QPK “补美边”的所有边长之和为9,求tan
的值.
(2)如图3,已知平行四边形ABCD中∠B=60°,AB=6,BC=8.点P在边AD上且AP=2,若∠QPK与平行四边形ABCD形成“补美边”的所有边长之和为10,请直接写出线段AE的长.
解决问题:(1)如图2,∠QPK与矩形ABCD形成“补美边”,点P在边AD上且AP=2.若已知矩形ABCD中AB=4,AD=8.分别记∠QPK的两边PQ和PK交矩形的边于点E和点F,设∠APE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②若∠QPK “补美边”的所有边长之和为9,求tan
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)如图3,已知平行四边形ABCD中∠B=60°,AB=6,BC=8.点P在边AD上且AP=2,若∠QPK与平行四边形ABCD形成“补美边”的所有边长之和为10,请直接写出线段AE的长.
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701167531524096/2706199561568256/STEM/25c2ac08413b49b6bc90bcdc3b1ed156.png?resizew=513)
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解答题-证明题
|
困难
(0.15)
【推荐1】如图,抛物线
经过
,
两点,并与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734212879450112/2737095525179392/STEM/1563c1ef-f4b2-4597-88ca-6d9e1e019812.png?resizew=184)
(1)求抛物线的解析式,写出
的值;
(2)若将
绕点
逆时针旋转,使点
与
轴正半轴上的点
重合,求证:
平分
;
(3)抛物线的对称轴上是否存在点
,使得
是以
为腰的等腰三角形.若存在,写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4551a0f6c42026bc3c53e7888d8a8dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51498008cd2b996a21759c7b22660382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734212879450112/2737095525179392/STEM/1563c1ef-f4b2-4597-88ca-6d9e1e019812.png?resizew=184)
(1)求抛物线的解析式,写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(3)抛物线的对称轴上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
|
困难
(0.15)
名校
【推荐2】如图,在菱形
中,分别过点
作
的垂线,过点
作
的垂线交于点
.
![](https://img.xkw.com/dksih/QBM/2021/2/20/2662002093178880/2672604779085824/STEM/30462fb5-dc67-489e-b092-81a221c9effc.png)
(1)如图1,若
,连接
,求证:
;
(2)如图2,若
,点
是
延长线上的一点,点
为
延长线上的一点,且
.连接
,
交
的延长线于点
,连接
.试猜想线段
的数量关系并证明你的结论;
(3)如图3,在(2)的条件下,在
上取一点
,使得
,已知
为直线
上一点,连接
,连接
,当
最小时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/2/20/2662002093178880/2672604779085824/STEM/30462fb5-dc67-489e-b092-81a221c9effc.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac243943fe617df5b72447bf2ca7fe28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2140f0f750d12f2c7e8591304f902f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbb2b5a1ca80ceaa5b6325205bf78fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3724eb2e142f776633a96b84ab6b7ef.png)
(3)如图3,在(2)的条件下,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9deb1ed4966a52bd23ce532a9a6d5ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d9cda5f798e080b0886e6b22bb3790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf129472bfc2c712a7a3d4870cd8215.png)
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解答题-证明题
|
困难
(0.15)
名校
【推荐1】如图,等腰直角三角形ABC中,
,
,点D是
边上的中点,点E是平面内一点,连接DE,将
,将
绕着点
逆时针旋转
,得到
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/c8585934-21e5-44fc-b452-e860f1733504.png?resizew=432)
(1)如图1,若点
在线段
上,
,
,求
的面积;
(2)如图2,若
点在直线
下方,点
是
中点,连接
,
,
,若
,求猜想线段
,
,
的长度关系,并证明你的结论.
(3)如图3,在(2)的条件下,作点E分别关于直线
和
的对称点
、
,连接
,
,
,当
时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/c8585934-21e5-44fc-b452-e860f1733504.png?resizew=432)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31bff282716d50968c13f80055ba78ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5177e614882eb4ee77a26f075de216b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,在(2)的条件下,作点E分别关于直线
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c227501a20ea6a72eaf7f9f25841e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f142d6f88beb4a288dcbc0b3e674326.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】(1)问题发现:如图1,在
和
中,
,
,
,连接
,
并延长交于点F. 填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
的值为 ;
的度数为 .
(2)类比探究:如图2,在
和
中,
,
,连接
交
的延长线于点F. 请判断
的值和
的度数,并说明理由;
(3)拓展延伸:在(2)的条件下,将
绕点A在平面内旋转,
,
所在直线交于点F,若
,
,请直接写出当点D与点F重合时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654d7550a20717faf4c079d682ba4c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cab3976641d2ad9aa50a30d4c8092cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
(3)拓展延伸:在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11aba28f503a684a232490d37bcd3fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/f14515d0-3eb4-474e-b210-f96f2208fe39.png?resizew=495)
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