已知正方形ABCD,点E是对角线AC上一点.
![](https://img.xkw.com/dksih/QBM/2022/9/18/3069177304727552/3083464258207744/STEM/e36930c061904c2986f657cde9d1da87.png?resizew=478)
(1)如图1,连接BE,DE,求证:BE=DE;
(2)如图2,F是DE延长线上一点,BF⊥BE,DF交AB于点G,求证:∠FBG=∠FGB;
(3)如图3,F是DE延长线上一点,BF⊥BE,DF交AB于点G,BF=BE,求证:
.
![](https://img.xkw.com/dksih/QBM/2022/9/18/3069177304727552/3083464258207744/STEM/e36930c061904c2986f657cde9d1da87.png?resizew=478)
(1)如图1,连接BE,DE,求证:BE=DE;
(2)如图2,F是DE延长线上一点,BF⊥BE,DF交AB于点G,求证:∠FBG=∠FGB;
(3)如图3,F是DE延长线上一点,BF⊥BE,DF交AB于点G,BF=BE,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3367b0f5aaed03cb828c64a1eaa15e.png)
更新时间:2022-10-08 21:07:00
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】(综合与实践)已知,在等边三角形
中,点E在
上,点D在
的延长线上,且
.
的中点时,确定线段
与
的大小关系,请你直接写出结论:
______
(填“
”、“
”或“
”);
(2)【特例启发,解答题目】如图2,当点E为
边上任意一点时,确定线段
与DB的大小关系,请你直接写出结论,
______
(填“
”、“
”或“
”);理由如下,过点E作
,交
于点F.(请你完成以下解答过程):
(3)【拓展结论,设计新题】如图3,在等边三角形
中,点E在直线
上,点D在线段
的延长线上,且
,若
的边长为1,
,求
的长(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)【特例启发,解答题目】如图2,当点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)【拓展结论,设计新题】如图3,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】写出定理“等腰三角形底边上的高线与中线互相重合”的逆命题,并证明这个逆命题是真命题.
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【推荐3】如图1,把一个含45°角的直角三角板ECF和一个正方形ABCD摆放在一起,使三角板的直角顶点和正方形的顶点C重合,点E、F分别在正方形边CB、CD上,连接AF,取AF中点M,EF的中点N,连接MD、MN.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/4c4b14b1-9d79-4fbc-af9a-7be2d5b904e0.png?resizew=550)
(1)连接AE,则△AEF是______三角形,MD、MN的数量关系是______.
(2)如图2,将图1中的直角三角板ECF绕点C顺时针旋转180°,其他条件不变,则MD、MN的数量关系还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)将图1中正方形ABCD及直角三角板ECF同时绕点C顺时针旋转90°,如图3,其他条件不变,则MD、MN的数量关系还成立吗?若成立,请加以证明;若不成立,请说明理.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/4c4b14b1-9d79-4fbc-af9a-7be2d5b904e0.png?resizew=550)
(1)连接AE,则△AEF是______三角形,MD、MN的数量关系是______.
(2)如图2,将图1中的直角三角板ECF绕点C顺时针旋转180°,其他条件不变,则MD、MN的数量关系还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)将图1中正方形ABCD及直角三角板ECF同时绕点C顺时针旋转90°,如图3,其他条件不变,则MD、MN的数量关系还成立吗?若成立,请加以证明;若不成立,请说明理.
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【推荐1】如图,点D在Rt△ABC的斜边AB上,且AC=6,
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368596780105728/2369323802099712/STEM/67997e66f7734e98b27b105b0369d36a.png?resizew=148)
(1) 若AB比BC大2,①求AB的长;②若CD⊥AB于点D,求CD的长.
(2)若AD=7,DB=11, ∠CDB=2∠B,求CD的长.
![](https://img.xkw.com/dksih/QBM/2020/1/2/2368596780105728/2369323802099712/STEM/67997e66f7734e98b27b105b0369d36a.png?resizew=148)
(1) 若AB比BC大2,①求AB的长;②若CD⊥AB于点D,求CD的长.
(2)若AD=7,DB=11, ∠CDB=2∠B,求CD的长.
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【推荐2】(1)发现:如图1,∠BAD=90°,AB=AD,过点B作BC⊥AC于点C,过点D作DE⊥AC于点E,由∠1+∠2=∠2+∠D=90°,得∠1=∠D,∠ACB=∠AED=90°,可以推理得到△ABC≌△DAE,进而得到AC=______,BC=_______.我们把这个数学模型称为“K字”模型或“一线三等角”模型;
(2)应用:如图2,在△ABC中,D是BC上一点,AC=AD=BD,∠CAD=90°,AB=6,请求出△ABC的面积;
(3)拓展:如图3,在平面直角坐标系xOy中,点A的坐标为(-1,-4),点B为平面内一点.若△AOB是以OA为斜边的等腰直角三角形,请直接写出点B的坐标
(2)应用:如图2,在△ABC中,D是BC上一点,AC=AD=BD,∠CAD=90°,AB=6,请求出△ABC的面积;
(3)拓展:如图3,在平面直角坐标系xOy中,点A的坐标为(-1,-4),点B为平面内一点.若△AOB是以OA为斜边的等腰直角三角形,请直接写出点B的坐标
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620463992315904/2622442121322496/STEM/0fa24f3e-8205-456e-b195-6d379d84443a.png)
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【推荐1】如图,O是矩形
对角线的交点,
于点E,延长
至点
,使
,连接
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061cdae70458bd1db2265bb9a98653f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cbd1d4bdcf1199ec44f9ba5348ac42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78cd6667cfcf009952d533893900748c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/ff7abc1e-2677-4539-a2f0-312c57bc194f.png?resizew=161)
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【推荐2】在直角三角形
中,
.
(1)已知
,求
;
(2)已知
,求
上的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea56d3db31ebd581c0781a9c81cfc301.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5afa58b0cf8d49f8bfa8ad80cd46c260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8de5b29d866c8a8dae2a4d055f26b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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名校
【推荐3】根据前面已经学过的“距离”我们知道:点到直线的“距离”是直线外一点和直线上各点连接的所有线段中最短的线段(即垂线段)的长度.类似的我们给出两个图形
的“距离”定义:如果点P为图形
上的任意一点,点Q为图形
上的任意一点,且P、Q两点的“距离”有最小值,那么称这个最小值为图形
的“距离”,记为
.特别地,当图形
有公共点时,图形
的“距离”
.
的
,点B、C在第一象限,若
,
,
,则
,菱形
,
菱形
;
(2)如图2,已知
的三个顶点的坐标分别为
,将一次函数
的图象记为L.
①若
,求k的取值范围;
②若
,且
,则k的值为 ;
(3)在平面直角坐标系中,点O为坐标原点,点
为平面内一点,其中n为任意实数,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5115984c1e8c147956b1b0827aafa8cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf431db4f5a694bec6769ba1d4448654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57417bfe67552a3a5f0b065003f551e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf431db4f5a694bec6769ba1d4448654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf431db4f5a694bec6769ba1d4448654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4cb3e8efee2db129f286b9c6cf0dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79684a6e92297749c005e2b23cac9710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edb6ad78c580479530edcab583f207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e10a18c189707505368d8cf9d0ed33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9672df9b22959833f2811cf33e26f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3149613f7956ac6313fa9498b2f161c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e165118791fbc5257a15229ecd92b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c892a50370529b1eca88bd9a84288a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e165118791fbc5257a15229ecd92b0.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c90c8945c4c684bb8e60fe6fa204f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170785d8eaffa7cb618e52c4580e95fb.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9ca62c6c45cd84c9b8c0e861d8e5c7.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e96c365394449565b65f10508aa67a.png)
(3)在平面直角坐标系中,点O为坐标原点,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7269b7a473a04b63dc1fbec97d22dfe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb27ac2e63b93447077e0c536c4b127f.png)
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【推荐1】如图1,在正方形
中,
是边
上一点(点
不与点
重合),点
是
的中点,
.
(1)如图2,过点
作
交
于点
,交
于点
.
①求证:
;
②求
的长.
(2)如图3,过点
作
交
于点
,连接
.直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94febfbf27f54ed0071cb59ac52719b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/11/7b188242-db62-4834-8e38-0f5549231a38.png?resizew=496)
(1)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51246bfbcf524ed6da2eceec37712470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e799f19fe0971dde22a862864a0dab7.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
(2)如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685bc9f51445c6ecd5158f4419969f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccb944784e7e1d5995f5c19e137e8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab2c33a927b152dc17455acf517c9eb.png)
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【推荐2】如图1,若四边形、四边形
都是正方形,显然图中有
.
(1)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015a76c3e5c80b9a14e16392f284cd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76956e451ab7fd18f473503c3745187d.png)
(2)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015a76c3e5c80b9a14e16392f284cd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
① 求证:;
②当时,求
的长.
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