问题提出
(1)如图1,在正方形
中,E、F分别是边
和对角线
上的点,
.求证:
;
问题探究
(2)如图2,在矩形
中,
,E,F分别是边
和对角线
的点,
,
,求
的长;
拓展延伸
(3)如图3,在菱形
中,
交
的延长线于点G.E,F分别是线段
和
上的点,
,
,求
的长.
(1)如图1,在正方形
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345c91c9e67e6ee00a872078ab17f094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2a0ee47f2bfbf68c8a1c4da23894e3.png)
问题探究
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b4da8d254b7d76b7615d7f7cd824a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6234f097c4a50340d86d0b9007d69eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051b3a459c945cc6ec4a17bc0e39566f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
拓展延伸
(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe8c741f56e946c1b454732f8faaa9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6234f097c4a50340d86d0b9007d69eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41f3062c3f910e418d0ac2bd62303de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2024/1/29/3421543211474944/3427181465468928/STEM/9c4072c539ce481fa6dab995d30eb73a.png?resizew=481)
更新时间:2024-02-06 12:01:27
|
相似题推荐
解答题-问答题
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【推荐1】如图,在矩形ABCD中,AD=4,DC=3,对角线AC、BD相交于点O,动点P、Q分别从点C、A同时出发,运动速度均为1cm/s,点P沿C→O→B运动.到点B停止,点Q沿A→D→C运动,到点C停止.连接AP、AQ、PQ,设△APQ的面积为y(cm2)(这里规定:线段是面积为0的几何图形),点Q的运动时间为x(s).
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795316261969920/2795967425724416/STEM/177e0bfc7d314584b58e3575562b825c.png?resizew=293)
(1)填空:BO=________cm;
(2)当PQ//CD时,求x的值;
(3)当
时,求y与x之间的函数关系式;
(4)直接写出在整运动过程中,使AQ=PQ的所有x的值.
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795316261969920/2795967425724416/STEM/177e0bfc7d314584b58e3575562b825c.png?resizew=293)
(1)填空:BO=________cm;
(2)当PQ//CD时,求x的值;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc1a1c6781dc4554c47e2affb00405c.png)
(4)直接写出在整运动过程中,使AQ=PQ的所有x的值.
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【推荐2】如图(1),在矩形
中,O为对角线
,
的交点,
,F为直线
上一动点,以
为边,在它的左侧作等边
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/8dfc3139-ebdd-4a05-994b-dfa1614ec6b6.png?resizew=520)
(1)当点F与点O重合时,判断四边形
的形状,并说明理由.
(2)如图(2),在点F运动的过程中,求证:
.
(3)若
时,当
时,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/8dfc3139-ebdd-4a05-994b-dfa1614ec6b6.png?resizew=520)
(1)当点F与点O重合时,判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
(2)如图(2),在点F运动的过程中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐1】如图,直线y=﹣x+4分别交x轴、y轴于A、C两点,抛物线y=﹣x2+mx+4经过点A,且与x轴的另一个交点为点B.连接BC,过点C作CD∥x轴交抛物线于点D
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220475147411456/2223279736717312/STEM/f9ee4aab2f00489fa64eb7201f48dadc.png?resizew=276)
(1)求抛物线的函数表达式;
(2)若点E是抛物线上的点,求满足∠ECD=∠BCO的点E的坐标;
(3)点M在y轴上且位于点C上方,点N在直线AC上,点P为第一象限内的抛物线上一点,若以点C、M、N、P为顶点的四边形是菱形,求菱形的边长.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220475147411456/2223279736717312/STEM/f9ee4aab2f00489fa64eb7201f48dadc.png?resizew=276)
(1)求抛物线的函数表达式;
(2)若点E是抛物线上的点,求满足∠ECD=∠BCO的点E的坐标;
(3)点M在y轴上且位于点C上方,点N在直线AC上,点P为第一象限内的抛物线上一点,若以点C、M、N、P为顶点的四边形是菱形,求菱形的边长.
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【推荐2】如图,在菱形
中,对角线
与
相交于点
,
,
,点E从点A 出发,沿
以每秒4个单位长度的速度向终点B运动,当点E与点A不重合时,过点E作
于点F,作
交
于点G,过点G作射线
垂线段
,垂足为点H,得到矩形
,设点E的运动时间为t秒.
;
(2)设矩形
与菱形
重叠部分图形的面积为S,求S与t之间的函数关系式;
(3)设矩形
的对角线
与
相交于点
,
①当
时,t的值为 ;
②当
时,求出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7001a66f455724e72b5b189687c4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2693fab4922833425c8daa73e1ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(2)设矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2693fab4922833425c8daa73e1ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)设矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2693fab4922833425c8daa73e1ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51b2e8654ffa49d05cae21612beee8.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ffa810ffe16cdd2e57cd62c5294fe8.png)
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解题方法
【推荐1】【问题情境】
在综合实践课上,同学们以“正方形和直线的旋转”为主题分组开展数学探究活动,已知正方形
,直线
经过点
,并绕点
旋转,作点
关于直线
的对称点
,直线
交直线
于点
,连结
、
.
【操作发现】
(1)如图1,若
.则
°,
°.
【拓展应用】
(2)如图2,当直线
在正方形
的外部时
①判断
的度数是否为一个定值?如果是,请求出此定值;如果不是,请说明理由.
②线段
、
、
之间存在特殊的数量关系,请写出这一关系式,并说明理由.
在综合实践课上,同学们以“正方形和直线的旋转”为主题分组开展数学探究活动,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【操作发现】
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b3c051bf2d67affd055c653c407380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40532acc0c01929171a76d7cd032507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac10b8c10ea893152cb829de5c2bbbf.png)
【拓展应用】
(2)如图2,当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,直线
与y轴、x轴分别交于点A,B,以
为边在第一象限内作正方形
,E是x轴上一动点,设点E坐标为
,
.连接
交
于点F,作直线
与y轴相交于点G.
(2)求证:
;
(3)是否存在这样的m值,使
轴?若存在,请求出此时的m值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc5f06fdf49e03c2d6559e8ed802e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3726021850f5b937bf61783869b4d68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b618d6e88889d598a7db00a28229a422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426823a6ce50fe56553676dc104efbfc.png)
(3)是否存在这样的m值,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0278777b8f4ab22fda45da944341575.png)
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解答题-作图题
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较难
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【推荐1】如图,已知矩形纸片ABCD,怎样折叠,能使边AB被三等分?
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497706742071296/2498488485019648/STEM/373cbeaedbdd4ab99e7268668ccc6207.png?resizew=132)
以下是小红的研究过程.
(1)整理小红的研究过程,说明AN=NQ=QB;
(2)用一种与小红不同的方法折叠,使边AB被三等分.(需简述折叠方法并画出示意图)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497706742071296/2498488485019648/STEM/373cbeaedbdd4ab99e7268668ccc6207.png?resizew=132)
以下是小红的研究过程.
思考过程 | 要使边AB被三等分,若从边DC上考虑,就是要折出DM=![]() 也就是要折出DM= ![]() 当DB、AM相交于F时,即要折出对角线上的DF= ![]() |
折叠方法和示意图 | ①折出DB;对折纸片,使D、B重合,得到的折痕与DB相交于点E;继续折叠纸片,使D、B与E重合,得到的折痕与DB分别相交于点F、G; ②折出AF、CG,分别交边CD、AB于M、Q; ③过M折纸片,使D落在MC上,得到折痕MN,则边AB被N、Q三等分. ![]() |
(1)整理小红的研究过程,说明AN=NQ=QB;
(2)用一种与小红不同的方法折叠,使边AB被三等分.(需简述折叠方法并画出示意图)
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名校
【推荐2】如图,四边形
是
的内接四边形,
为直径,点
为弧
的中点,延长
交于点
,
为
的切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/1525003e-75ed-49ca-b5bf-53e5c43291b8.png?resizew=183)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/1525003e-75ed-49ca-b5bf-53e5c43291b8.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4748010af2b117057264c79b90fb203a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bed5e5d2c3457320033e703118e79fe.png)
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