如图甲,正方形
和等腰直角
有公共点
,点
是直线
上一动点,连接
,取
的中点
,连接
.
(1)【方法体会】线段
,
有着特别的关系,请依据思路将横线处补充完整.
解:在图甲中,将线段
延长至点
,使
,连接
,
,交
于点
.
则:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a1e0c08b99addcc37e4176f5882e8f.png)
即:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9195d58eb86b8cfacc37f3782eec27a7.png)
在
和
中:
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c20968b91619283dd0bf4810cd3086.png)
∴______(
)
∴
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81f683bfa5fb4f5d901503bfa7ccf26.png)
设
,
交于点
,
又∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e655be1d2908b97ed4df568a10177013.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6d4df1654d5d59864a7d4fd3bd27dd.png)
∴
,即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79216c6a32bb699aeb36144da020490.png)
又∵点
是
中点,点
是
中点
∴
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14985aca12e83ce0d6400b65857c9a0.png)
又∵
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79216c6a32bb699aeb36144da020490.png)
∴
,
的位置关系是
_____;数量关系是______.
(2)【探索发现】如图乙,
交
于点
,交
于点
,交
于点
,当点
与点
重合时,求
:
的值;
(3)【拓展运用】若正方形的边长为
,连接
,
,在点
运动的过程中,当
时,请在备用图中画出此时的图形,并求出此时
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862730f28c12750ebea0af5edcac5fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/5a5fa1b3-5fba-4355-8120-99cda6f5fdce.png?resizew=509)
(1)【方法体会】线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
解:在图甲中,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90c579436ff500a36fe7976012bc227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8b62dc033d86ee9e561b8903796701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
则:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a1e0c08b99addcc37e4176f5882e8f.png)
即:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9195d58eb86b8cfacc37f3782eec27a7.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaecf08a22124a457128fb04c9c02bb.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c20968b91619283dd0bf4810cd3086.png)
∴______(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d7d84e698f6d38fa2be14d36c04988.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343f75b2c5479c279abca2faed278901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81f683bfa5fb4f5d901503bfa7ccf26.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/06ea4ec9-979b-4a8e-b791-ecdd1567f6b0.png?resizew=236)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e655be1d2908b97ed4df568a10177013.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6d4df1654d5d59864a7d4fd3bd27dd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86129aef281bd7f5da10963e5164d6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79216c6a32bb699aeb36144da020490.png)
又∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe5747aaac225fd08ad9789789b3804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14985aca12e83ce0d6400b65857c9a0.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343f75b2c5479c279abca2faed278901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79216c6a32bb699aeb36144da020490.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bff235ce9338aeef7f2b952079cbb0f.png)
(2)【探索发现】如图乙,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a36775168095280f72504478345bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f37d57768f163f56619e531b9541ab.png)
(3)【拓展运用】若正方形的边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f30cb81835298cb612a828f355060a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd63ce2206748eb84eb2bebf459e754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e323c08b18488d11bd8f3cd74efa971a.png)
更新时间:2024-03-22 19:59:14
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】已知,如图1,△ABC中,AC=BC,DE为△ABC的中位线,P为边AB上一点,连接DP,以DP为一边在右侧作△DPQ,使DP=DQ,且∠PDQ=∠ACB,连接EQ并延长交直线BC于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/5356d1a8-e58c-40a3-af5e-7b52959de46e.png?resizew=565)
(1)求证:△APD≌△EQD;
(2)若∠ACB=120°,判断BC与CH的数量关系,并说明理由;
(3)在(2)的条件下,如图2,延长DQ交BC于点G,若AC为2,求AP为何值时△HQG为直角三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/30/5356d1a8-e58c-40a3-af5e-7b52959de46e.png?resizew=565)
(1)求证:△APD≌△EQD;
(2)若∠ACB=120°,判断BC与CH的数量关系,并说明理由;
(3)在(2)的条件下,如图2,延长DQ交BC于点G,若AC为2,求AP为何值时△HQG为直角三角形.
您最近一年使用:0次
解答题-证明题
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【推荐2】如图,在
中,点O是
的中点,以O为圆心,
为半径作
,交
于点D,交
于点E,弧
与弧
相等,点F在线段
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/63c1242d-0e52-4557-9421-8297d582726c.png?resizew=153)
(1)求证:
;
(2)判断
与
的位置关系,并加以证明;
(3)若
的半径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e6f2bd7b22c94bf069806590db0ac3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/63c1242d-0e52-4557-9421-8297d582726c.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50b0ab75412e2ed1fef95110f9cbf89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】(1)【观察猜想】我们知道,正方形的四条边都相等,四个角都为直角.如图1,在正方形
中,点E,F分别在边
上,连接
,并延长
到点G,使
,连接
.若
,则
之间的数量关系为______;
(2)【类比探究】如图2,当点E在线段
的延长线上,且
时,试探究
之间的数量关系,并说明理由;
(3)【拓展应用】如图3,在
中,
,D,E在
上,
,若
的面积为16,
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6c310fa3c3363a42fe869a70bcc080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e9f8f8598ffafaf6168f64799c8b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3caa3a88e409d81f8b87507ce2692ed4.png)
(2)【类比探究】如图2,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3caa3a88e409d81f8b87507ce2692ed4.png)
(3)【拓展应用】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436cc600f2cd2fd77a7823bc348537a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】如图,边长为6的正方形
的顶点O在坐标原点处,点A、C分别在x轴、y轴的正半轴上,点D是
边上的点(不与点A重合),
,且与正方形外角平分线
交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/6898313c-f613-428d-8de7-9088d636baa1.png?resizew=188)
(1)当点D坐标为
时,求证![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f21678a0009eb39b6886653d295b09a.png)
(2)若点D坐标为
,结论
是否成立,请说明理由;
(3)在y轴上是否存在点M,使得四边形
是菱形?若存在,求出点M的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/6898313c-f613-428d-8de7-9088d636baa1.png?resizew=188)
(1)当点D坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f21678a0009eb39b6886653d295b09a.png)
(2)若点D坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f81a0780efb9c7e876d88a8332a548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f21678a0009eb39b6886653d295b09a.png)
(3)在y轴上是否存在点M,使得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b66f367b8e9e87b57149b7a3c10e4c9.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知:四边形ABCD中,AD∥BC,AD=AB=CD,∠BAD=120°,点E是射线CD上的一个动点(与C、D不重合),将△ADE绕点A顺时针旋转120°后,得到△ABE',连接EE'.
(1)如图1,∠AEE'= °;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/1be0fe78-8593-4090-8327-36c0c4190cb4.png?resizew=184)
(2)如图2,如果将直线AE绕点A顺时针旋转30°后交直线BC于点F,过点E作EM∥AD交直线AF于点M,写出线段DE、BF、ME之间的数量关系;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/c31fbfa6-110f-435e-853e-7df37bf38cec.png?resizew=204)
(3)如图3,在(2)的条件下,如果CE=2,AE=
,求ME的长.
(1)如图1,∠AEE'= °;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/1be0fe78-8593-4090-8327-36c0c4190cb4.png?resizew=184)
(2)如图2,如果将直线AE绕点A顺时针旋转30°后交直线BC于点F,过点E作EM∥AD交直线AF于点M,写出线段DE、BF、ME之间的数量关系;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/c31fbfa6-110f-435e-853e-7df37bf38cec.png?resizew=204)
(3)如图3,在(2)的条件下,如果CE=2,AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/e0078fe4-4a16-47ed-9c5a-79aebdff9ac8.png?resizew=189)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】如图,抛物线
经过点
,
,直线
交
轴于点
,且与抛物线交于
、
两点.
为抛物线上一动点(不与点
,
重合).
(1)求抛物线的解析式;
(2)当点
在直线
上方时,过点
作
轴交
于点
,
轴交
于点
,求
的最大值;
(3)设
为直线
上的点,以
,
,
,
为顶点的四边形能否构成平行四边形?若能,请直接写出点
的坐标;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df573e9c4cd69bd8918f991b284526e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da50ebd2656745259525c8b157e389e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fb2c28ec678860d22a424c882edcfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d942c1cb82aab8b14bbd637a53aff62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求抛物线的解析式;
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0460f1eb55926472115811f0a3e86598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f50c36555c899b75b90906502a051e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240db5860c29a905eb1c6af32a35143f.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/6/26/2493179976220672/2494617968353280/STEM/aadd4339-eb5b-4557-ae1d-876e3831e137.png?resizew=566)
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解答题-计算题
|
较难
(0.4)
解题方法
【推荐3】如图①,是一张直角三角形纸片,∠B=90°,AB=12,BC=8,小明想从中剪出一个以∠B为内角且面积最大的矩形,经过操作发现,当沿着中位线DE、EF剪下时,所得的矩形的面积最大.
(1)请通过计算说明小明的猜想是否正确;
(2)如图②,在△ABC中,BC=10,BC边上的高AD=10,矩形PQMN的顶点P、N分别在边AB、AC上,顶点Q、M在边BC上,求矩形PQMN面积的最大值;
(3)如图③,在五边形ABCDE中,AB=16,BC=20,AE=10,CD=8,∠A=∠B=∠C=90°.小明从中剪出了一个面积最大的矩形(∠B为所剪出矩形的内角),求该矩形的面积.
(1)请通过计算说明小明的猜想是否正确;
(2)如图②,在△ABC中,BC=10,BC边上的高AD=10,矩形PQMN的顶点P、N分别在边AB、AC上,顶点Q、M在边BC上,求矩形PQMN面积的最大值;
(3)如图③,在五边形ABCDE中,AB=16,BC=20,AE=10,CD=8,∠A=∠B=∠C=90°.小明从中剪出了一个面积最大的矩形(∠B为所剪出矩形的内角),求该矩形的面积.
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437998698872832/2438714906828800/STEM/61f5a5cd9bd9402b8b47473166a0c6e0.png?resizew=297)
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Rt△ABC中,∠ACB=90°,AB=5,cos∠BAC
,点O是边AC上一个动点(不与A、C重合),以点O为圆心,AO为半径作⊙O,⊙O与射线AB交于点D,以点C为圆心,CD为半径作⊙C,设OA=x.
(2)当点D在线段AB上,如果⊙C与AB的另一个交点E在线段AD上时,设AE=y,试求y与x之间的函数解析式,并写出x的取值范围;
(3)在点O的运动过程中,如果⊙C与线段AB只有一个公共点,请直接写出x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe427803eef028e4d698f3d677cfebb.png)
(2)当点D在线段AB上,如果⊙C与AB的另一个交点E在线段AD上时,设AE=y,试求y与x之间的函数解析式,并写出x的取值范围;
(3)在点O的运动过程中,如果⊙C与线段AB只有一个公共点,请直接写出x的取值范围.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图,△ABC内接于⊙O(∠ACB>90°),连接OA,OC.记∠BAC=α,∠BCO=β,∠BAO=γ.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942405553971200/2957472327262208/STEM/97ba61cd-5e1d-45f3-9df2-fad71f587908.png?resizew=187)
(1)探究α与β之间的数量关系,并证明.
(2)设OC与AB交于点D,⊙O半径为1,
①若β=γ+45°,AD=2OD,求由线段BD,CD,弧BC围成的图形面积S.
②若α+2γ=90°,设sinα=k,用含k的代数式表示线段OD的长.
![](https://img.xkw.com/dksih/QBM/2022/3/23/2942405553971200/2957472327262208/STEM/97ba61cd-5e1d-45f3-9df2-fad71f587908.png?resizew=187)
(1)探究α与β之间的数量关系,并证明.
(2)设OC与AB交于点D,⊙O半径为1,
①若β=γ+45°,AD=2OD,求由线段BD,CD,弧BC围成的图形面积S.
②若α+2γ=90°,设sinα=k,用含k的代数式表示线段OD的长.
您最近一年使用:0次