如图,将长方形
沿直线
对折,将点B折到点E处,
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/7020b7e7-4b7d-46df-9faf-3f7e72df3696.png?resizew=155)
(1)求证:
是等腰三角形;
(2)若
,求
.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/7020b7e7-4b7d-46df-9faf-3f7e72df3696.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e58291be7fa4f27155e3a4c56124e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2023-03-28 23:17:23
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图1,点
分别在直线
上,
平分
交
于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/8062e40c-efb0-44b4-8c20-5068677a8e7a.png?resizew=439)
(1)判断直线
与直线
的位置关系,并说明理由.
(2)如图2,点
在射线
上,
的平分线交
于点
.
①若
,求
的度数;
②若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f867cc0b738774541d8569eaf8d7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/8062e40c-efb0-44b4-8c20-5068677a8e7a.png?resizew=439)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e90b61b597057c8d4a99714d79e119e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55690660eb5bdc8b63c199a38c1967b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00a45445a350af441eef0067b462dd1.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1499ebac65a569dd1e9ba89a7eac2d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62de69363d4559d27033326848704ecf.png)
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【推荐2】问题:如图,在
ABCD中,AB=9,AD=6,∠DAB,∠ABC的平分线AE,BF分别与直线CD交于点E,F,求EF的长.
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017661337198592/3055867372044288/STEM/72909669fdee45fcb1d6784c9587b52d.png?resizew=162)
答案:EF=3
探究:
(1)把“问题”中的条件“AB=9”去掉,其余条件不变.
①当点E与点F重合时,求AB的长;
②当点E与点C重合时,求EF的长.
(2)把“问题”中的条件“AB=9,AD=6”去掉,其余条件不变,当点 C,D,E,F 相邻两点间的距离相等时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017661337198592/3055867372044288/STEM/72909669fdee45fcb1d6784c9587b52d.png?resizew=162)
答案:EF=3
探究:
(1)把“问题”中的条件“AB=9”去掉,其余条件不变.
①当点E与点F重合时,求AB的长;
②当点E与点C重合时,求EF的长.
(2)把“问题”中的条件“AB=9,AD=6”去掉,其余条件不变,当点 C,D,E,F 相邻两点间的距离相等时,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
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【推荐1】阅读下列材料,解答问题:
定义:线段
把等腰三角形
分成
与
(如图1),如果
与
均为等腰三角形,那么线段
叫做
的完美分割线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/c5c4e887-1304-481a-9f69-77597611884f.png?resizew=449)
(1)如图2,在
中,
,
,
.求证:
为
的完美分割线;
(2)如图3,
是一等腰三角形纸片,
,
是它的一条完美分割线,且
,将
沿直线
折叠后,点C落在点
处,
交
于点M.求证:
.
定义:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/c5c4e887-1304-481a-9f69-77597611884f.png?resizew=449)
(1)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2677ee9264fd2b6338e4ed853c91e320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c033ae86abd2433e5a9b74ce298ad48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6dd6144cfc7bec4d581b33cbcb58726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db609c0ddcb9af21ddbf443d3e527cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
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【推荐2】综合与实践
问题背景:四边形
是正方形,E为对角线
所在直线上一动点(不与点A,C重合),连结
,将线段
绕点B按逆时针方向旋转
得到线段
,连结
.
(1)如图1,当点E在线段
上时,求证:
.
探索发现:
(2)如图2,当点E在
的延长线上时,线段
与
的数量关系为_________,直线
与
的位置关系为_________.
(3)如图3,当点E在
的延长线上时,连结
并延长,分别交
边于点G,交
的延长线于点F,试猜想
与
的数量关系,并说明理由.
问题背景:四边形
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/0d472477-4e1c-4d5f-b019-721c403e0953.png?resizew=534)
(1)如图1,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef117060dfe6887a4373e7ca3ac90bee.png)
探索发现:
(2)如图2,当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】如图,一次函数
的图象与x轴交于点A,与y轴交于点B,点P、Q分别从A、B两点同时出发,以相等的速度做直线运动.已知点P沿射线
运动,点Q沿线段
的延长线运动,
与
所在直线相交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/ba74074f-ab79-45e8-80e1-bb3d010a2d79.png?resizew=165)
(1)求线段
的长度;
(2)当
时,点D是否平分线段
?请说明理由;
(3)若
,设
的面积为y,请写出y与x的函数关系式,并指出自变量x的取值范围;
(4)若点P运动的速度为2,运动的时间为t,则t为何值时,
为等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d899543122fe39aa7011e1e81089566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/ba74074f-ab79-45e8-80e1-bb3d010a2d79.png?resizew=165)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98823cbc09ca52df1fbcc446eba3e44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
(4)若点P运动的速度为2,运动的时间为t,则t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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真题
【推荐2】我市的前三岛是众多海钓人的梦想之地.小明的爸爸周末去前三岛钓鱼,将鱼竿
摆成如图1所示.已知
,鱼竿尾端A离岸边
,即
.海面与地面
平行且相距
,即
.
(1)如图1,在无鱼上钩时,海面上方的鱼线
与海面
的夹角
,海面下方的鱼线
与海面
垂直,鱼竿
与地面
的夹角
.求点O到岸边
的距离;
(2)如图2,在有鱼上钩时,鱼竿与地面的夹角
,此时鱼线被拉直,鱼线
,点O恰好位于海面.求点O到岸边
的距离.(参考数据:
,
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd66854d3a2d397beb0e31aa2102a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f988fbab729c370acabf2fb63cb7559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b0e78b35ed431026e82402823c3744f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f8039a874d818f0067ad4dc93bdd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551abfb73661d53aac8638cefddb6708.png)
(1)如图1,在无鱼上钩时,海面上方的鱼线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec7e3a486e8b9cbf78323e87f8ea0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24072fd120fcec1b5ccf089b626c4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(2)如图2,在有鱼上钩时,鱼竿与地面的夹角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df34f0e0d972b58772bfcd5997ca93b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402537ee76e8b7781e860012e267fd80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7e780742a4dc9d7dfb5d4d1adc9bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70c9b1f0a159e6cfcad25890ee66626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c8d86d304069fb4b15ca518ad55d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a6838c68ce0b6821536d4e168d4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f49328408982f411cd32c5326289997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c480c2d133edba72891035661875ea30.png)
![](https://img.xkw.com/dksih/QBM/2021/6/17/2744710574964736/2745082490028032/STEM/c0a94b14-4888-43d0-9d7b-ba0f7e949ea0.png)
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【推荐1】如图,由△ABC中,
,
,
.按如图所示方式折叠,使点B、C重合,折痕为DE,求出AE和AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348216467fda035329fe8fac46b39911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
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解答题-证明题
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【推荐2】如图,在矩形ABCD中,点E在边CD上,将该矩形沿AE折叠,使点D落在边BC上的点F处,过点F作FG∥CD,交AE于点G,连接DG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/a84af3e9-bfce-4e52-b251-900d777998fb.png?resizew=151)
(1)求证:四边形DEFG为菱形;
(2)若CD=8,CF=4,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/a84af3e9-bfce-4e52-b251-900d777998fb.png?resizew=151)
(1)求证:四边形DEFG为菱形;
(2)若CD=8,CF=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cdbbcd3b4fbd05cf6053ee61eca798.png)
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