在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
中,
的平分线交直线
于点
、交
的延长线于点
,连接
.
,若
,
是
的中点,连接
、
.
①求证:
.
②请判断
的形状,并说明理由;(提示:连接
)
(2)如图
,若
,将线段
绕点
顺时针旋转
至
,连接
、
,那么
又是怎样的形状.(直接写出结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
②请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1975abdfba3d89ee75a40e4239f6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1975abdfba3d89ee75a40e4239f6e7.png)
更新时间:2024-05-18 16:04:48
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,已知
和
均为等腰直角三角形,
,点
为
的中点,过点
与
平行的直线交射线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/5290567e-bcfc-4010-8c86-d2f11825301f.png?resizew=419)
(1)当
,
,
三点在同一直线上时(如图1),求证:
为
的中点;
(2)将图1中的
绕点
旋转,当
、
、
三点在同一直线上时(如图2),求证:
为等腰直角三角形;
(3)将图1中
绕点
旋转到图3位置时,当
、
、
三点在同一直线上时(如图3)(2)中的结论是否仍成立?若成立,试证明之,若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43503bfc6f75d8e968eb5eb034a2db58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/5290567e-bcfc-4010-8c86-d2f11825301f.png?resizew=419)
(1)当
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db609c0ddcb9af21ddbf443d3e527cfa.png)
(3)将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在△ABC中,∠ACB=90°,D为AB中点,点E,F分别在直线BC,AC上(点E不与点B,C重合),DF⊥DE,连接EF.
(1)如图1,当点F与点A重合时,AB=8,DE=3,求EF的长;
(2)如图2,当点F不与点A重合时,求证:AF2+BE2=EF2;
(3)若AC=8,BC=6,EC=2,求线段CF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/90180587-5b69-4d80-8071-70b6874f78cf.png?resizew=465)
(1)如图1,当点F与点A重合时,AB=8,DE=3,求EF的长;
(2)如图2,当点F不与点A重合时,求证:AF2+BE2=EF2;
(3)若AC=8,BC=6,EC=2,求线段CF的长.
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】已知:如图,△AOB的顶点O在直线上,且AO=AB.
(1)画出△AOB关于直线成轴对称的图形△COD,且使点A的对称点为点C;
(2)在(1)画出的图形中,AC与BD的位置关系是 ;
(3)在(1)画出的图形中连接AD,如果∠ABD=2∠ADB.
求证:△AOC是等边三角形,并直接写出∠DAO∶∠DAB的值.
(1)画出△AOB关于直线成轴对称的图形△COD,且使点A的对称点为点C;
(2)在(1)画出的图形中,AC与BD的位置关系是 ;
(3)在(1)画出的图形中连接AD,如果∠ABD=2∠ADB.
求证:△AOC是等边三角形,并直接写出∠DAO∶∠DAB的值.
![](https://img.xkw.com/dksih/QBM/2019/11/12/2332379428618240/2332982664732672/STEM/7410ad9579fe45bba973cbd59770576d.png?resizew=108)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图1,△ABC的AB边为圆O的弦,AC、BC分别交圆O于D、E,弧AD=弧BE,∠C=60°;
![](https://img.xkw.com/dksih/QBM/2019/11/27/2342800929914880/2343458178695169/STEM/1d9636fdef5347e7820661695735eb9e.png?resizew=486)
(1)求证:△ABC为等边三角形;
(2)如图2,F为弧AD上一点,连接FE并延长至G,连接BG,若∠AFB=∠G,求∠FBG的正弦值;
(3)如图3,在(2)的条件下,连接FC并延长交BG延长线于H,若CF=CH,AF=7,HG=12,求线段BF的长度.
![](https://img.xkw.com/dksih/QBM/2019/11/27/2342800929914880/2343458178695169/STEM/1d9636fdef5347e7820661695735eb9e.png?resizew=486)
(1)求证:△ABC为等边三角形;
(2)如图2,F为弧AD上一点,连接FE并延长至G,连接BG,若∠AFB=∠G,求∠FBG的正弦值;
(3)如图3,在(2)的条件下,连接FC并延长交BG延长线于H,若CF=CH,AF=7,HG=12,求线段BF的长度.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,四边形
、
为全等的矩形.且矩形
的对角线交于点E,点A在
上,
.将矩形
绕点E顺时针旋转а角
,如图2,
、
与
分别相交于N、M.
![](https://img.xkw.com/dksih/QBM/2015/4/29/1573833411837952/1573833418244096/STEM/367fb0e0e71f49b08ba055f4af3eee6d.png?resizew=347)
(1)求证:
;
(2)若
,求旋转角а的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0fef6d9c3728c72031987b7782c20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2015/4/29/1573833411837952/1573833418244096/STEM/367fb0e0e71f49b08ba055f4af3eee6d.png?resizew=347)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a194fd6313939a1bd9194ba5705bfe12.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d04fa881aa0bdedf27af48f18c88b1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,已知四边形
为矩形,
,
,点E在
上,
,点F为平面内一点,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/90e00918-5752-4012-905c-a46ccc59ad69.png?resizew=235)
(1)求
的长;
(2)若
,求此时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8bb13740ac13266fe08f0f24948d5ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10787ce380382dfd1cf02255a623d80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/90e00918-5752-4012-905c-a46ccc59ad69.png?resizew=235)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c1d1009d271836e65e4b95a97c214c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
真题
【推荐3】综合与实践
问题情境:数学活动课上,王老师给同学们每人发了一张等腰三角形纸片探究折叠的性质.
已知
,点
为
上一动点,将
以
为对称轴翻折.同学们经过思考后进行如下探究:
独立思考:小明:“当点
落在
上时,
.”
小红:“若点
为
中点,给出
与
的长,就可求出
的长.”
实践探究:奋进小组的同学们经过探究后提出问题1,请你回答:
问题1:在等腰
中,
由
翻折得到.
(1)如图1,当点
落在
上时,求证:
;
(2)如图2,若点
为
中点,
,求
的长.
问题解决:小明经过探究发现:若将问题1中的等腰三角形换成
的等腰三角形,可以将问题进一步拓展.
问题2:如图3,在等腰
中,
.若
,则求
的长.
问题情境:数学活动课上,王老师给同学们每人发了一张等腰三角形纸片探究折叠的性质.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72467b008f1d47a0e9fe7ee11b4cf95.png)
![](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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
独立思考:小明:“当点
![](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/316154beb752fec134f578f7b26a9941.png)
小红:“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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
实践探究:奋进小组的同学们经过探究后提出问题1,请你回答:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/0d3d9c7a-148b-4506-a904-c789472a8425.png?resizew=574)
问题1:在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdd82251e0b1d735690625920dd10e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(1)如图1,当点
![](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/316154beb752fec134f578f7b26a9941.png)
(2)如图2,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/1f2696f21c6373f99b58d54185224cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
问题解决:小明经过探究发现:若将问题1中的等腰三角形换成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ee7149bd58649b5c8b84439e118e53.png)
问题2:如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9902dbc37675863e08452bebf18ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,抛物线
经过点
,点
;直线
:
与
轴、
轴分别相交于
、
两点.点
在线段
上运动,过
点作
轴的垂线与线段
交于点
,与抛物线交于点
.
(1)写出抛物线的解析式_______;
(2)如图1,
的面积为
,求
与
的函数表达式,并求出
的最大值,并写出此时点
的坐标;
(3)如图2,在
的条件下,将直线
绕点
按顺时针方向旋转得到直线
,当直线
与直线
重合时停止旋转,在旋转过程中,直线
与线段
交于点
,设点
、
到直线
的距离分别为
、
,当
最大时,求直线
旋转的角度
即
的度数);
(4)如图,当直线
是抛物线的对称轴,点
在直线
上,若
为钝角,请直接写出点
纵坐标
的取值范围_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047412269900c910c1ddb36a5e1d015e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44eb32420adda64655476362d6916777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d78a08d6b64905a5a7daefac8889c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c728334a9352ba1c820509532dc37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/80cd1dcb-467c-4429-b896-451f9c62d375.png?resizew=487)
(1)写出抛物线的解析式_______;
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4edd4d6067c20c1e680d730dbb6d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff338f62e93f16b3e5e72bec30dd26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcf554a2dd977c741b71b82ecabcb1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a4b32d388558eb9a9e4f0f2dd57c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9518b14bc81ba2ae824a660877c18a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0248941233bcf886e39d3b5c543aa23.png)
(4)如图,当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03526fddc48f9f7298afc3da414c2e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03526fddc48f9f7298afc3da414c2e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4797472e7d0007532d3bf3ecb5170b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】【问题情境】
在一次数学兴趣小组活动中,小明同学将一大一小两个三角板按照如图
所示的方式摆放.其中
,
,
.
【问题探究】
小明同学将三角板
绕点
按顺时针方向旋转.
(1)如图
,当点
落在边
上时,延长
交
于点
,求
的长;
(2)若点
、
、
在同一条直线上,求点
到直线
的距离;
(3)连接
,取
的中点
,三角板
由初始位置(图
),旋转到点
、
、
首次在同一条直线上(如图
),求点
所经过的路径长;
(4)如图
,
为
的中点,则在旋转过程中,点
到直线
的距离的最大值是 .
在一次数学兴趣小组活动中,小明同学将一大一小两个三角板按照如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74db1f028c135803c5f56852ec330d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fef865457af4bddbb5093135c67242b.png)
【问题探究】
小明同学将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab8a10e675354fa0c6e7da3d06b999d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/a0da9150-8a41-464b-a4b5-f4d4a496062f.jpg?resizew=423)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/c220df14-6781-471c-ae01-f28ca46e443b.jpg?resizew=403)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab8a10e675354fa0c6e7da3d06b999d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(4)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐3】下半学期的学习中,我们将接触到几何学上的明珠——勾股定理:直角三角形中,两直角边的平方和等于斜边的平方.
千百年来,人们对它的证明之若,其中有著名的数学家,也有业余数学爱好者,有普通的老百姓,也有尊贵的政要权贵,甚至有国家总统.下面试举三例,一起领略其魅力.
(1)【验证】图
是由两个边长分别为
的直角三角形和一个两条直角边都是
的直角三角形拼成,试用两种不同的方法表示这个图形的面积,通过计算证明勾股定理;
(2)【应用】如图
,
和
都是等边三角形,点
在
内部,连接
.若
,
,
,求
的长;
(3)【提升】如图
,将等边
沿
翻折得到
,连结
交
于点
,点
在
上且
,
,点
是
内的一个动点,连结
,求
的最小值.
千百年来,人们对它的证明之若,其中有著名的数学家,也有业余数学爱好者,有普通的老百姓,也有尊贵的政要权贵,甚至有国家总统.下面试举三例,一起领略其魅力.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/2f9c79ec-d1f1-406c-ba32-67a9179e21b3.jpg?resizew=495)
(1)【验证】图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)【应用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3914a619338bd79a65933baaa67d349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8c8b7f52cb48a21fdcff3e837a123d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)【提升】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](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/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38cadcdf6a87f47017a8b1d9bf3d2d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e7669920d4cea80be4d6efb20a4226.png)
您最近一年使用:0次