如图,在
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
,点D从点A出发以
的速度运动到点C停止.作
交边
或
于点E,以
为边向右作正方形
.设点
的运动时间为
.
的长;
(2)当点F在边
上时,求
的值;
(3)设正方形
与
重叠部分图形的面积为
,当重叠部分图形为四边形时,求
关于
的函数解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439a8f6e8ccd03e2bc0df99d372b4ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f36881389561386786a55c699141e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7251130c0d245119e067e494e898b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8728adf63c69d50003ef5922c65941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(2)当点F在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdff15fafea9a3b60d69a1789ef0220a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27edfcf8b9d43514b9bd80289f89b2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb194fd63b75af067ba10dee7471d299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2024-04-21 12:07:17
|
相似题推荐
解答题-问答题
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【推荐1】【材料阅读】我国古人对勾股定理的研究非常深邃.如图1,已知直角三角形三边长为a,b,c(c为斜边),由勾股定理:
,得
,则
,得到:
.
从而得到了勾股定理的推论:己知直角三角形三边长为a,b,c(c为斜边),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f2dde623143b7ed0f02d6c748b4e36.png)
【问题解决】如图2,已知
的三边长分别为
,如何计算
的面积?据记载,古人是这样计算的:作
边上的高
.以
的长为斜边和直角边作
(如图3),其中
.
(1)用古人的方法计算
的值,完成下面的填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2eeb0fe06d8bf424f1da2d7a312006b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9250590e6a6a578f70abce7b022374f6.png)
=[(__________)
(__________)
]-[(__________)
-(__________)
]
=__________
(2)试直接利用阅读材料中勾股定理的推论继续完成
面积的计算过程;
(3)你还有其他计算
的面积的方法吗?写出解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a7f373be78ed21b3a6f2030a9cca9dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ec3b14e7311353843708222dfddf70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e03d5f704b8d3ccd1b2e1e863cef86d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e506bfde1d82ece44dc163548db2ff.png)
从而得到了勾股定理的推论:己知直角三角形三边长为a,b,c(c为斜边),则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f2dde623143b7ed0f02d6c748b4e36.png)
【问题解决】如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054f1ed18d43b3feeaa2657df5edad4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe1e3f36ca4a9be251487c87fa92210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73fbc2f33d3402cd96a776a376d9835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17eb319551d4c1369492106440b89251.png)
(1)用古人的方法计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86504114cc05893a64f01a53cca2407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2eeb0fe06d8bf424f1da2d7a312006b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9250590e6a6a578f70abce7b022374f6.png)
=[(__________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44b1dd99b717fa723c43979f74a0965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
=__________
(2)试直接利用阅读材料中勾股定理的推论继续完成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)你还有其他计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】小明在一次数学活动中,进行了如下的探究活动:如图,在矩形
中,
,
,以点B为中心,顺时针旋转矩形
,得到矩形
,点A、D、C的对应点分别为G、F、E.
(1)如图①,当点G落在
边上时,求
的长;
(2)如图②,当点G落在线段
上时,
与
交于点H.
①求证:
;
②求
的长.
(3)记点K为矩形
对角线的交点,连接
,记
面积为S,求S的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b47a7fd147edfbf3f0ef21bff9fc77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/091a79b7-f063-4510-80d6-4116bf213011.png?resizew=373)
(1)如图①,当点G落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)如图②,当点G落在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834c8b34cb536a88451272fb3768122c.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(3)记点K为矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c294eeff5621bce37bc16096621eea5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6cea0b2b4f0e7c29e118b272da3e8b.png)
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名校
【推荐1】如图,点M是正方形ABCD的边BC上一点,连接AM,点E是线段AM上一点,∠CDE的平分线交AM延长线于点F.
(1)如图1,若点E为线段AM的中点,BM:CM=1:2,BE=
,求AB的长;
(2)如图2,若DA=DE,求证:BF+DF=
AF.
(1)如图1,若点E为线段AM的中点,BM:CM=1:2,BE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(2)如图2,若DA=DE,求证:BF+DF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/13/9aed0b80-f581-4b92-9b68-d47c50ab57d4.png?resizew=259)
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【推荐2】在平面直角坐标系xOy中,对于两点A,B,给出如下定义:以线段AB为边的正方形称为点A,B的“确定正方形”.如图1为点A,B的“确定正方形”的示意图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/8333f524-fa1c-4aa9-9873-2aeb55a6c0ae.png?resizew=449)
(1)如果点C的坐标为(0,1),点D的坐标为(2,1),画出点C,D的一个“确定正方形”,这个正方形的面积是 ;
(2)已知点O的坐标为(0,0),点M为直线y=x+b(b>0)上一动点,当点O,M的“确定正方形”的面积最小,且最小面积为1时,求b的值.
(3)已知点E在以边长为2的正方形的边上,且该正方形的边与两坐标轴平行,对角线交点为P(m,0),点F在直线y=﹣x﹣2上,若要使所有点E,F的“确定正方形”的面积都不小于2,直接写出m的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/8333f524-fa1c-4aa9-9873-2aeb55a6c0ae.png?resizew=449)
(1)如果点C的坐标为(0,1),点D的坐标为(2,1),画出点C,D的一个“确定正方形”,这个正方形的面积是 ;
(2)已知点O的坐标为(0,0),点M为直线y=x+b(b>0)上一动点,当点O,M的“确定正方形”的面积最小,且最小面积为1时,求b的值.
(3)已知点E在以边长为2的正方形的边上,且该正方形的边与两坐标轴平行,对角线交点为P(m,0),点F在直线y=﹣x﹣2上,若要使所有点E,F的“确定正方形”的面积都不小于2,直接写出m的取值范围.
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【推荐1】如图①,在四边形
中,
,
,
.
的度数;
(2)如图②,
为线段
的中点,连接
,求证:
;
(3)如图③,若
,线段
上有一动点
,连接
,将
沿
所在直线翻折至
的位置,
为
的对应点,连接
,
,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622d184859249054afbe9cc7aea5e8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8f0a7ce3aff4332a2937e6ebde7af.png)
(3)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0f993cf5b6ef5f2585b21c557ac331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f8a33ab7b6d46fc6aa88c370e54983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a51268fce97426487c3338d6ec3d571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d26381caa8fdcb797d4fd10cf8d9427.png)
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【推荐2】已知,如图1,过点
作平行于x轴的直线l,抛物线
上的两点A、B的横坐标分别为
和4,直线
交y轴于点F,过点A、B分别作直线l的垂线,垂足分别为点C、D,连接
、
.
(2)求证:
;
(3)点P是抛物线
对称轴右侧图象上的一动点,过点P作
交x轴于点Q,是否存在点P使得
与
相似?若存在,请求出所有符合条件的点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2dc2ccb5041b74ee198e41f881f60b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937c5db73d81da5525d4d35885dac04f.png)
(3)点P是抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099086365ab1ccc937dc17e4b3485037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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【推荐1】如图
,将边长为
的正方形
压扁为边长为
的菱形
.在菱形
中,
的大小为
,面积记为
.
(1)请补全上表;
(2)填空:由(
)可以发现边长是
的正方形在压扁的过程中,菱形的面积随着
大小的变化.不妨把边长为
,
的菱形面积
记为
.由此可以归纳出
;
(3)两块相同的等腰直角三角形按图二的方式放置,
,探究图中两个带阴影的三角形面积是否相等?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() |
(1)请补全上表;
(2)填空:由(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd7229922fbb3ce09dada883f74fbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd188bc7de6e53a43511daa577ac131.png)
(3)两块相同的等腰直角三角形按图二的方式放置,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e6ec2a109c45b20e99a9b915bd7efa2.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】【问题初探】
(1)在数学活动课上,李老师给出如下问题:如图1,在
中,
,
为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的右侧,连接
,你能得到哪些结论呢?
①小明说:“在点
的运动过程中,只要保证
在边
的右侧,
的度数是固定的,我能求出
的度数”;小强说:“在点
的运动过程中,只要保证
在边
的右侧,我能得到从点
发出的三条线段
,
,
的数量关系”.
请你根据小涛的思路,求
的度数,并探究线段
,
,
的数量关系.
![](https://img.xkw.com/dksih/QBM/2024/3/18/3456455720771584/3458929292107776/STEM/6efd954cb2614cff9b40a3a27e393391.png?resizew=345)
【类比分析】
(2)李老师发现同学们都利用了转化的思想,转化角,转化线段,为了帮助同学们更好地感悟转化思想,李老师将图1进行变换,并提出下面问题,请你解答.
如图3,在
中,
,
为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的左侧,连接
,过
作
于点
,求证:
.
【学以致用】
(3)如图4,在
中,
,
为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的右侧,连接
,
,过
作
于
,线段
的中点为
,连接
,若
,求四边形
的面积.
(1)在数学活动课上,李老师给出如下问题:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.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/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
①小明说:“在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/03902478df1a55bc99703210bccab910.png)
②小涛说:“我利用,如图2,在
上截取
,连接
,再利用旋转的性质,就可以得到小明和小强的结论”.
请你根据小涛的思路,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.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/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2024/3/18/3456455720771584/3458929292107776/STEM/6efd954cb2614cff9b40a3a27e393391.png?resizew=345)
【类比分析】
(2)李老师发现同学们都利用了转化的思想,转化角,转化线段,为了帮助同学们更好地感悟转化思想,李老师将图1进行变换,并提出下面问题,请你解答.
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.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/b6834a0601cbb9cb4b6065d25c370216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9bff988abfbb5445c477e3f4a07ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed0b2b203b943bec29c4f3c2d1a8971.png)
【学以致用】
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.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/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb350b8e577a7b6712031a3b5b98309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0091935a8ea039d96fead15167ddea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐3】如图,四边形
中,
,
,
,
,
于点E,线段
沿
以每秒1个单位的速度向点C运动得到线段NP,点M从点D出发沿
以每秒2个单位的速度向点A运动.连接
交
于点Q,连接
,设运动时间为t秒(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/e861a3f9-16de-4959-8bb0-297d8eed4384.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/57fe1d53-1c67-4615-a9fc-175023303a38.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/c4b8680f-1bc1-44e9-8716-3ab911b7b319.png?resizew=171)
(1)如图1,连接
、
,当t为何值时,四边形
为平行四边形;
(2)设四边形
面积为S,求S与t之间的函数关系式;
(3)如图2,是否存在某一个时刻t,使
为直角三角形?若存在,求出t的值;若不存在,说明理由.
(4)是否存在某一个时刻t,使
平分
?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0870247d35bf60ae14239f608da44759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2aa9b9894a953c812b52eba95559f33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/e861a3f9-16de-4959-8bb0-297d8eed4384.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/57fe1d53-1c67-4615-a9fc-175023303a38.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/c4b8680f-1bc1-44e9-8716-3ab911b7b319.png?resizew=171)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c10c10f627059102596e2ba0f0235b5.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/052ba6d08ab7d56a7fdf75d185b92825.png)
(3)如图2,是否存在某一个时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51496e5f2d2f91c5c4aade9bc504ecfb.png)
(4)是否存在某一个时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc94d2886db80a11b81b71f9a6d1d7a.png)
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