已知点
为
和
的公共顶点,将
绕点
顺时针旋转
,连接
,
,请完成如下问题:
(1)如图1,若
和
均为等边三角形,线段
与线段
的数量关系是______;
(2)类比探究:如图2,若
,
,其他条件不变,请写出线段
与线段
的数量关系,并说明理由;
(3)拓展应用:如图3,
是
内一点,
,
,
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335c1d4db7d83b1271c2d6ff87a24b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/77085092-8736-4b4e-8a37-c1184b5c0889.png?resizew=458)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)类比探究:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa74660971ce04b1041ecec0462e87e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab83ac7814caf45813ba7689f34a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展应用:如图3,
![](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/36395a1f890888bae8c6b1cfb95e8d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587458141d890533c0c32aa249a27ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
更新时间:2023-05-08 16:57:17
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】综合与实践
问题情境:
在数学活动课上,老师出示了这样一个问题:如图
,现有一个等腰直角三角形纸板
,
,
,
为斜边
上的中线,沿
把
纸板剪开,再将
绕点
逆时针旋转![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870bc09e7436e1f22b9cdf2466ec6b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
得到
,其中点
的对应点为
,点
的对应点为
,连接
和
.试判断
与
之间的数量关系和位置关系,并说明理由,
猜想与证明:
(1)请解答老师提出的问题;
(2)如图2,边
,
的中点分别为
,
,连接
.试判断
和
之间的数量关系,并加以证明;
探索发现:
(3)如图3,创意小组的同学在前面同学的启发下,连接
,发现
与
之间的数量关系是固定不变的,请直接写出
与
之间的数量关系.
问题情境:
在数学活动课上,老师出示了这样一个问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06662eecbf8a7d5581c2ffc70d8096d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015193db50f39587c2a68438769d16e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c3f982d999937891eec4cb22d62e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870bc09e7436e1f22b9cdf2466ec6b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6354f4a82aaa384d54a3766063f6e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b191522ca0314621f99753cce07d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/444249fb-80a1-40ef-a2f0-4d13c733ba3c.png?resizew=500)
猜想与证明:
(1)请解答老师提出的问题;
(2)如图2,边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
探索发现:
(3)如图3,创意小组的同学在前面同学的启发下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
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【推荐2】综合与实践
问题情境:数学活动课上,王老师出示了一个问题:
如图1,在
中,
,点
是
边上一点,连接
平分
交
于点
,点
是
上一点,连接
并延长交
于点
.求证:
.
独立思考:(1)请解答王老师提出的问题;
实践探究:(2)王老师提出了新问题,求证
.王老师的问题引发了同学们的思考,并积极地进行了小组讨论.在展示交流的过程中,小明同学分享了他的思路,他先发现并证明了
和
相等,然后又构造全等得到了结论.相信你也得到了启发,请你完成证明
.
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,如图2,当
时,可以求
的值,请你尝试完成解答.
问题情境:数学活动课上,王老师出示了一个问题:
如图1,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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd91e8cc90a5cf6700458e44b7cb141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fc4485030643f3aa33691c219446db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/6a9ed567-82aa-4b3b-b2c7-4f4d46ef90ef.png?resizew=324)
独立思考:(1)请解答王老师提出的问题;
实践探究:(2)王老师提出了新问题,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e87e323066922a1e3222f8d40d870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e87e323066922a1e3222f8d40d870.png)
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c281b4121d25121fd825d5db3bad5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191d3e974d58be407c3b80e7f81b48a0.png)
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解答题-问答题
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(0.4)
解题方法
【推荐1】如图,直线
经过点
,点
,与直线
交于点C,点D为直线AB上一动点,过D点作x轴的垂线交直线OC于点E.
(1)求点C的坐标;
(2)当
时,求△CDE的面积;
(3)当
沿着OD折叠,当点A落在直线OC上时,直接写出点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee3c3a54f0aedd4f254211969ec19ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4099f26e9d06e3080ac702d0a3ea51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86bebdf5931efbdc627baa52f97392e.png)
(1)求点C的坐标;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f68e3f1f32212d5ef81addcdcda55eb.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7bd8bfbd43d0cf1604b8d7e0023f57.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2891458962046976/2893404118204416/STEM/bd424607-a348-4768-9708-d42f095cdb55.png?resizew=364)
您最近一年使用:0次
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【推荐2】如图,在平面直角坐标系
中,直线
分别交
轴、
轴于点
、
,将正比例函数
的图象沿
轴向下平移
个单位长度得到直线
,直线
分别交
轴、
轴于点
、
,交直线
于点
.
(1)直接写出直线
对应的函数表达式;
(2)在直线
上存在点
(不与点
重合),使
,求点
的坐标;
(3)在
轴上是否存在点
,使
?若存在,求点
的坐标;若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfa0a247b81fff6408ad8f85dfc9a1b.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)直接写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)在直线
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01009f2f3a3476fd1efe90291083132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3cad39a260c8c7c9a6ba5ec5149d919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/50b1c4b5-46ac-4afc-aa9a-35ed954fd24d.png?resizew=220)
您最近一年使用:0次
【推荐3】【背景】如图1,在△ABC中,AB=AC,过点A的直线MN∥BC,点D是直线MN上的一动点,将射线DB绕着点D逆时针旋转,交线段AC于点P,使∠BDP=∠BAC,试说明:DB=DP.
小丽提出了自己的想法:如图2在线段AB上取一点F,使DA=DF,通过证明△BDF≌△PDA可以解决问题.
②若AC=6,BC=4,AD=3,求AP的长.
【拓展】如图3,过点A的直线MN∥BC, AB=3 cm,AC=4cm,点D是直线MN上一点,点P是线段AC上的一点,连接DP,使得∠BDP=∠BAC,求
的值.
小丽提出了自己的想法:如图2在线段AB上取一点F,使DA=DF,通过证明△BDF≌△PDA可以解决问题.
②若AC=6,BC=4,AD=3,求AP的长.
【拓展】如图3,过点A的直线MN∥BC, AB=3 cm,AC=4cm,点D是直线MN上一点,点P是线段AC上的一点,连接DP,使得∠BDP=∠BAC,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9776e1e64a51247d8ca3f1c3cd4b9f75.png)
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【推荐1】如图1,已知△ABC中,∠ACB=90°,CA=CB,点D,E分别在CB,CA上,且CD=CE,连AD,BE,F为AD的中点,连CF.
![](https://img.xkw.com/dksih/QBM/2019/3/4/2154517758181376/2169056990969856/STEM/34c5ed79bd0145729d8dd3eec781ff0f.png?resizew=336)
(1)求证:CF=
BE,且CF⊥BE;
(2)将△CDE绕点C顺时针旋转一个锐角(如图2),其它条件不变,此时(1)中的结论是否仍成立?并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2019/3/4/2154517758181376/2169056990969856/STEM/34c5ed79bd0145729d8dd3eec781ff0f.png?resizew=336)
(1)求证:CF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)将△CDE绕点C顺时针旋转一个锐角(如图2),其它条件不变,此时(1)中的结论是否仍成立?并证明你的结论.
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名校
解题方法
【推荐2】如图1,菱形
绕点
顺时针旋转
,得到菱形
,连接
,
、分别与
,
相交于点
,
.射线
,
交于点
,
.
(1)当
时,四边形
的形状为 .
(2)求
与
的数量关系.
(3)如图2.连接
,若
,
,求
的值.
(4)如图3,连接
,
,若
,
,四边形
能否为菱形?若能,直接写出
的值和
的长;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c01c1714d425983405b95fe75009947.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaede1903f1708fd70ab6ba98647a154.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)如图2.连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23038cae3090dc99133bb6ddb3ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(4)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b6603435ffd865c143d41b144e13a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/2021/10/9/2825664442777600/2829916435660800/STEM/41afc122-4bc8-4fb9-9931-a2ffbf9b5a65.png)
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解题方法
【推荐1】二次函数y=﹣x2+bx+c与x轴分别交于点A和点B,与y轴交于点C,直线BC的解析式为y=﹣x+3,AD⊥x轴交直线BC于点D.
(1)求二次函数的解析式;
(2)M(m,0)为线段AB上一动点,过点M且垂直于x轴的直线与抛物线及直线BC分别交于点E、F.直线AE与直线BC交于点G,当
时,求m值.
(1)求二次函数的解析式;
(2)M(m,0)为线段AB上一动点,过点M且垂直于x轴的直线与抛物线及直线BC分别交于点E、F.直线AE与直线BC交于点G,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac4f324b979a7f4b2d8b229972364f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/c42306ee-7d5f-42bb-9ad5-8e1eceb20d64.png?resizew=229)
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【推荐2】如图,在
中,
,
cm,
cm,点P由点B出发沿BA的方向向点A匀速运动,速度为1cm/s,同时点Q由A出发沿AC方向向点C匀速运动,速度为1cm/s,连接PQ.设运动的时间为t(s),其中
.解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893773420363776/2894110252613632/STEM/2a97e1dd-f3ed-47f3-a6f8-2daacb95adf4.png?resizew=655)
(1)
,
;(用含t的代数式表示)
(2)当t为何值时,
∽
;
(3)当P、Q在运动过程中,
能否成为等腰三角形?若能,求出此时t的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569066b11a0854ac51784b255d2d09c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98f0db1041fa3f958e44c09a5483f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5b9dcaad80aac0466c3f2fc9cf4ba4.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893773420363776/2894110252613632/STEM/2a97e1dd-f3ed-47f3-a6f8-2daacb95adf4.png?resizew=655)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b870879f86f05dba740bb836cfa61b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25844c2c39f7b4940b1f44b3df8711cd.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600818a284d95c11aff9044010fff92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1285b0c1e6048791195ea2451b43c4.png)
(3)当P、Q在运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600818a284d95c11aff9044010fff92e.png)
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