如图,在
中,
,
.点P从点B出发,沿
以每秒2个单位长度的速度向终点C运动,同时点Q从点C出发,沿折线
以每秒5个单位长度的速度运动,到达点A时,点Q停止1秒,然后继续运动.分别连接
、
.设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/8/24/3051305646956544/3130826257506304/STEM/2c4d674d4cc3488aab38c018e9674897.png?resizew=212)
(1)求点A与
之间的距离;
(2)当
时,求t的值;
(3)当
为钝角三角形时,求t的取值范围;
(4)点P关于直线
的对称点是点D,连接
,当线段
与
的某条边平行时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ea680b12a5495fc2acbb98b6e13b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://img.xkw.com/dksih/QBM/2022/8/24/3051305646956544/3130826257506304/STEM/2c4d674d4cc3488aab38c018e9674897.png?resizew=212)
(1)求点A与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697161e5547a3a49e57e68e3ffedf3fa.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d8ea93db7e78bd7235fc85e3c4c55a.png)
(4)点P关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
更新时间:2022-12-14 19:05:14
|
相似题推荐
解答题-作图题
|
困难
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【推荐1】某班数学兴趣小组对函数
的图象与性质进行了探究,探究过程如下,请补充完整.
(1)自变量
的取值范围是
,
与
的几组对应值列表如下:
其中,
______;
(2)根据上表数据,在如图所示的平面直角坐标系中画出该函数的图象:
①函数
可以看成是由函数
先向______平移______个单位长度,再向______平移______个单位长度得到的;
②函数
的图象关于______成中心对称;
③写出这个函数的一条性质:______________________________;
④结合你所画的函数图象,直接写出不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0868c69690dec6996ab80c4fd92016db.png)
(1)自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | … | ![]() | ![]() | ![]() | ![]() | 0 | ![]() | ![]() | 2 | 3 | 4 | 5 | 9 | … |
![]() | … | ![]() | 1 | ![]() | 0 | ![]() | ![]() | 10 | 6 | 4 | ![]() | 3 | ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)根据上表数据,在如图所示的平面直角坐标系中画出该函数的图象:
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b2816b29b58b052fabf7705253346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324b2816b29b58b052fabf7705253346.png)
③写出这个函数的一条性质:______________________________;
④结合你所画的函数图象,直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab66ffb507afde39a16a34874a02c270.png)
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【推荐2】类比推理是一种推理方法,即根据两种事物在某些特征上的相似,作出它们在其他特征上也可能相似的结论.触类旁通,即用类比的方法提出问题及寻求解决问题中的途径和方法.
请用类比的方法,解决以下问题:
(1)①已知
,则依据此规律
____;
②请你利用拆项法进行因式分解:
_____;
(2)若
满足
,求
的值;
(3)受此启发,解方程
.
观察下列计算过程:![]() ![]() ![]() 这就是解稍复杂的计算中常用到的裂项相消法,即把每项恰当拆分,使得其中部分分数相互抵消,简化计算. | 阅读下面一道例题的解答过程: 因式分解: ![]() 解:我们可以将 ![]() ![]() ![]() 即原式 ![]() ![]() ![]() 在因式分解中,我们有时需要对多项式的某一项拆成两项或多项,其目的是使多项式能进行因式分解,像这样的方法称为拆项法. |
(1)①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04374154795f55f153a8f704c4d2e445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f98b13b50e488decb690da7fa63429c.png)
②请你利用拆项法进行因式分解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da8d1e22b78d826bc968014665f021b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b6afbd1d274c71f7626dbeac60d408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60d85a729b7f427c6f17ba5cfd8b6a1.png)
(3)受此启发,解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc6fb91ede92c9af06ba2ca3a40c6ed.png)
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名校
【推荐1】在正方形
中,点E是
边上的动点,且
,在
上依次截取
,
,直线
与直线
交于点P
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/1cc1ef1b-189f-466d-b579-15345c234f83.png?resizew=370)
(1)如图(1),当
时,求
的度数
(2)如图(2),当
时,作
于点M,
于点Q,连接
,N为
中点,连接
,试探究
与
的数量关系,并证明你的结论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987ebcb7a610848d0e6188152cfbfc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a2e63e2e76266d606946a11c1d75de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be311a436782b2a838073212453ef2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/1cc1ef1b-189f-466d-b579-15345c234f83.png?resizew=370)
(1)如图(1),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4bd1ff6961b94344115437d96e1bdb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937ab5aebc4af11586a602b0b4b97fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd067af13db0202761f71490d6a74444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc94d2886db80a11b81b71f9a6d1d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8490cab76a1a6e5cb35de8535be9be.png)
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【推荐2】如图,平面直角坐标系中,
、
,且
、
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42669c8ec1ebcaf9b2b67b2d8cd9ab62.png)
(1)求
、
两点的坐标;
(2)过点
的直线
上有一点
,连接
、
,
,如图2,当点
在第二象限时,
交
轴于点
,延长
交
轴于点
,设
的长为
,
的长为
,用含
的式子表示
;
(3)在(2)的条件下,如图3,当点
在第一象限时,过点
作
交
于点
,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781aee9ca4b18054dab13de4c0320e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42669c8ec1ebcaf9b2b67b2d8cd9ab62.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)在(2)的条件下,如图3,当点
![](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/86afd4f2661a9208c4e600e318408777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6d08059d829b47609ec95217d714d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519d3cbe962154438e43a23b0d9eda2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407553130168320/2408250962214912/STEM/2929c6fa32d34a9c83725e2aa5045f8c.png?resizew=650)
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【推荐1】如图①,在平面直角坐标系中,
是第一象限内一点,过点
的直线分别与
轴、
轴的正半轴交于
,
两点,且
是
的中点,以
为直径的
交直线
于点
(位于点
右下方),交
轴于点
,连接
交
于点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c751b702db4404154be9b9b691a8ff94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
(3)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd65e0e5e69c375884509de566a4f2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76981622e3684aca12435743b6a08a8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554645462113f7c8e22f7ac28887f5c9.png)
①用含的代数式表示
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e289f441a542bf577e8f28dbc6a622a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
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解答题-问答题
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【推荐2】已知,A(0,8),B(4,0),直线y=﹣x沿x轴作平移运动,平移时交OA于D,交OB于C.
(1)当直线y=﹣x从点O出发以1单位长度/s的速度匀速沿x轴正方向平移,平移到达点B时结束运动,过点D作DE⊥y轴交AB于点E,连接CE,设运动时间为t(s).
①是否存在t值,使得△CDE是以CD为腰的等腰三角形?如果能,请直接写出相应的t值;如果不能,请说明理由.
②将△CDE沿DE翻折后得到△FDE,设△EDF与△ADE重叠部分的面积为y(单位长度的平方).求y关于t的函数关系式及相应的t的取值范围;
(2)若点M是AB的中点,将MC绕点M顺时针旋转90°得到MN,连接AN,请直接写出AN+MN的最小值.
(1)当直线y=﹣x从点O出发以1单位长度/s的速度匀速沿x轴正方向平移,平移到达点B时结束运动,过点D作DE⊥y轴交AB于点E,连接CE,设运动时间为t(s).
①是否存在t值,使得△CDE是以CD为腰的等腰三角形?如果能,请直接写出相应的t值;如果不能,请说明理由.
②将△CDE沿DE翻折后得到△FDE,设△EDF与△ADE重叠部分的面积为y(单位长度的平方).求y关于t的函数关系式及相应的t的取值范围;
(2)若点M是AB的中点,将MC绕点M顺时针旋转90°得到MN,连接AN,请直接写出AN+MN的最小值.
![](https://img.xkw.com/dksih/QBM/2019/5/23/2209712010395648/2212166394331136/STEM/8aad43faf17b4704949542bfad6fd852.png?resizew=460)
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解答题-证明题
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名校
解题方法
【推荐1】在综合实践课上,老师组织同学们以“矩形的折叠”为主题开展数学活动.有一张矩形纸片
,点E在射线
上,现将矩形折叠,折痕为
,点A的对应点记为点F.
(1)操作发现:如图1,若点F恰好落在矩形
的边
上,直接写出一个与
相似的三角形;
(2)深入探究:如图2,若点F落在矩形
的边
的下方时,
、
分别交
于点M、N,过点F作
,
,垂足分别为点G、H,当点G是
的中点时,试判断
与
是否相似,并证明你的结论;
(3)问题解决:在(2)的条件下,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/8c3c6108-6305-4633-9bd7-6d658c3a058f.png?resizew=403)
(1)操作发现:如图1,若点F恰好落在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
(2)深入探究:如图2,若点F落在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8415862fa74b26eb56966696ebb9ff84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5334469e92d39043db84d86b792aaa.png)
(3)问题解决:在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9e036eecc9aebcc2d2a2855bbfafdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】已知抛物线y=ax2﹣4ax﹣12a与x轴相交于A,B两点,与y轴交于C点,且OC=
OA.设抛物线的顶点为M,对称轴交x轴于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/1e535a7d-6eed-492e-b9fa-880be48fd4d3.png?resizew=601)
(1)求抛物线的解析式;
(2)如图1,点E(m,n)为抛物线上的一点,且0<m<6,连接AE,交对称轴于点P.点F为线段BC上一动点,连接EF,当PA=2PE时,求
EF+
BF的最小值.
(3)如图2,过点M作MQ⊥CM,交x轴于点Q,将线段CQ向上平移t个单位长度,使得线段CQ与抛物线有两个交点,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/1e535a7d-6eed-492e-b9fa-880be48fd4d3.png?resizew=601)
(1)求抛物线的解析式;
(2)如图1,点E(m,n)为抛物线上的一点,且0<m<6,连接AE,交对称轴于点P.点F为线段BC上一动点,连接EF,当PA=2PE时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fd7940df8100511c9b98ed85d014a3.png)
(3)如图2,过点M作MQ⊥CM,交x轴于点Q,将线段CQ向上平移t个单位长度,使得线段CQ与抛物线有两个交点,求t的取值范围.
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐3】(1)如图1,在正方形ABCD中,点E,F分别是AB,AD上的两点,连接DE,CF,若
,则
的值为______;
(2)如图2,在矩形ABCD中,
,
,点E是AD上的一点,连接CE,BD,若
,则
的值为______;
(3)如图3,在四边形ABCD中,
,点E为AB上一点,连接DE,过点C作DE的垂线交ED的延长线于点G,交AD的延长线于点F,求证:
;
(4)如图4,在
中,
,
,将
沿BD翻折,点A落在点C处,得到
,点F为线段AD上一动点,连接CF,作
交AB于点E, 垂足为点G,连接AG.设
,求AG的最小值.
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927644228231168/2932492463161344/STEM/dda7b6d9-4ad1-4a38-af26-45e0d8088668.png?resizew=493)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
(2)如图2,在矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
(3)如图3,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e97080b39cc4448164fbe62f296e44.png)
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068dd508ca4182106e02589c533297c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a259656caff73f08304c865fe8f5205e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10384aed1cfcf1f031768cb3e1ad94dd.png)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927644228231168/2932492463161344/STEM/dda7b6d9-4ad1-4a38-af26-45e0d8088668.png?resizew=493)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927644228231168/2932492463161344/STEM/afda74de-771a-48a9-b7c6-0ac92a6b9312.png?resizew=239)
您最近一年使用:0次