1 . 如图①,四边形ABCD是边长为4的正方形,M是正方形对角线BD(不含B、D两个端点)上任意一点,将△BAM绕点B逆时针旋转60°得到△BEN,连接EA、MN;P是AD的中点,连接PM.
(1)AM+PM的最小值等于 ;
(2)求证:△BNM是等边三角形;
(3)如图②,以B为坐标原点建立平面直角坐标系,若点M使得AM+BM+CM的值最小,求M点的坐标.
(1)AM+PM的最小值等于 ;
(2)求证:△BNM是等边三角形;
(3)如图②,以B为坐标原点建立平面直角坐标系,若点M使得AM+BM+CM的值最小,求M点的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/7f3216cc-b2a4-4c8a-9837-baf3d2369a4e.png?resizew=449)
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2 . 如图,在矩形
中,
,
,
为
边上的一动点,
、
为
边上的两个动点,且满足
,则线段
长度的最小值为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e116c1e68c2666a7c25d9d1aae485b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2021/9/9/2804608436617216/2810925446168576/STEM/721514f2-4ab4-48f3-8f1c-fd102ae5cad1.png?resizew=270)
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解题方法
3 . 已知,
和
都是等腰直角三角形,
,
,
,分别过点B、D作
、
,两平行线交于点F,连接
.
![](https://img.xkw.com/dksih/QBM/2021/9/5/2801416388616192/2802297903620096/STEM/f4cb5d26aa2f4d44ac5a7e4eb2b30523.png?resizew=542)
(1)如图1、若点E在
上,
,
,求
的长;
(2)如图2,将
绕点C逆时针旋转,使点E落在
上,若
,
交
于点G,
交
于点H,求
的值.
(3)如图3,若
,
,将
绕点C旋转一周,当
的长最大时,直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2006c850c663a13645731190fa1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51708e0ec7cbd6e27f941ab0456d3f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153b0f89993a7b3bb7a227e89d73d349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59239d2d861274c15d23a8834e9db6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2021/9/5/2801416388616192/2802297903620096/STEM/f4cb5d26aa2f4d44ac5a7e4eb2b30523.png?resizew=542)
(1)如图1、若点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b714bbc5628e1df56a18d75d2d0a5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/14fa18c5f29e610d44cac124b18c5913.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
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4 . 如图,已知抛物线y=ax2+bx+c(a≠0)过原点O和点A(3,﹣3),F(1,
)是该抛物线对称轴上的一个定点,过y轴上的点B(0,
)作y轴的垂线l.
(1)求抛物线的解析式;
(2)点P(m,n)是抛物线上的任意一点,过点P作直线l的垂线,垂足为M.求证:点P在线段FM的垂直平分线上;
(3)点E为线段OA的中点,在抛物线上是否存在点Q,使
QEF周长最小?若存在,求点Q的坐标和
QEF周长的最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
(1)求抛物线的解析式;
(2)点P(m,n)是抛物线上的任意一点,过点P作直线l的垂线,垂足为M.求证:点P在线段FM的垂直平分线上;
(3)点E为线段OA的中点,在抛物线上是否存在点Q,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/7/11/2761667687170048/2799708056018944/STEM/c1733d59-73b3-4605-ae8e-d0a5e4189e9f.png)
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2021-09-02更新
|
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|
2卷引用:2021年山东省日照市田家炳中学九年级下学期一模考试数学试题
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5 . 如图,在△ABC中,∠ACB=90°,点D为AB边上任意一点,连接AD,以点D为旋转中心,将线段DA顺时针旋转90°,点A的对应点是点E,连接AE,取AE的中点F,连接DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/140c5a7e-35cf-4dcb-8a41-b76cbbdca807.png?resizew=560)
(1)如图1,若∠CAD=30°,DF=6,求线段CD的长.
(2)如图1,连接CF,求证:
;
(3)如图2,若AC=6,BC=8,点D在线段BC上运动,点G在线段DE上运动,连接AG,取线段AG的中点P,连接BP、BF、PF,当线段PB最大时,直接写出△BPF的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/140c5a7e-35cf-4dcb-8a41-b76cbbdca807.png?resizew=560)
(1)如图1,若∠CAD=30°,DF=6,求线段CD的长.
(2)如图1,连接CF,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7740e8fe8de70a1136c4dbe1b7d0fa7a.png)
(3)如图2,若AC=6,BC=8,点D在线段BC上运动,点G在线段DE上运动,连接AG,取线段AG的中点P,连接BP、BF、PF,当线段PB最大时,直接写出△BPF的面积.
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6 . 如图,正方形
的边长为4,
为
边上一点,
AE=1.5,
为
边上一动点,连接
,以
为边向右作等腰直角
,
,连接
.当
取最小值时,
的长度是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1563ce496f108272863a8fcc9fdd1aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754931380330496/2781691076206592/STEM/99b06f54f789418f8efe985c2b857b9a.png?resizew=208)
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7 . 如图,在正方形ABCD中,E是BC上一点(不与点B,C重合),连接DE,点C关于直线DE的对称点为C′,AC′并延长交直线DE于点P,过点D,B分别作DF⊥AP于F,BK⊥AP于K.
(1)求∠FDP的度数
(2)连接BP,试证明BP=
AF.
(3)连接BC,若正方形ABCD的边长是
,请直接写出△BCP面积的最大值 .
(1)求∠FDP的度数
(2)连接BP,试证明BP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)连接BC,若正方形ABCD的边长是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/27/2751743792054272/2784616085168128/STEM/f08d6dff330c42cca06edeeafa43bb96.png?resizew=139)
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8 . 如图,在矩形ABCD中,AB=4,AD=6,点P在AD上,点Q在BC上,且AP = CQ,连接CP,QD,则PC + QD的最小值为( )
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772124511100928/2779514706092032/STEM/43e8add5cada42df8e05ad06e16e7f50.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772124511100928/2779514706092032/STEM/43e8add5cada42df8e05ad06e16e7f50.png?resizew=107)
A.8 | B.10 | C.12 | D.20 |
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2021-08-05更新
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931次组卷
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7卷引用:福建省泉州市南安市2020-2021学年八年级下学期期末数学试题
9 . 如图,在平行四边形纸片ABCD中,AD=6cm,将纸片沿对角线BD对折,边AB的对应边BF与CD边交于点E,此时△BCE恰为等边三角形.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728048306003968/2779476939767808/STEM/e2a2831a-d30a-4937-b84f-a67e8582d714.png)
(1)求AB的长度;
(2)重叠部分的面积为 ;
(3)将线段BC沿射线BA方向移动,平移后的线段记作B'C',请直接写出B'F+C'F的最小值.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728048306003968/2779476939767808/STEM/e2a2831a-d30a-4937-b84f-a67e8582d714.png)
(1)求AB的长度;
(2)重叠部分的面积为 ;
(3)将线段BC沿射线BA方向移动,平移后的线段记作B'C',请直接写出B'F+C'F的最小值.
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10 . 如图,在四边形
中,
,四边形
的面积为
,连接对角线
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1396b0a6962d106947748c63564a610b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87719c94aace6c1d828d71d8f362c153.png)
![](https://img.xkw.com/dksih/QBM/2021/7/2/2755799855480832/2770383106301952/STEM/ff72740050d74c2294136d6f5adca20a.png?resizew=185)
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