鹿鸣学堂数学兴趣小组在研究角平分线时进行了总结:角平分线的定义;角平分线的性质和判定;角平分线的作图以及与角平分线有关的构造…
【问题提出】①小王同学发现,三角形中的角平分线还有其他的结论:
如图①,
是
的角平分线,则有
.
小丽同学的思路;如图①,过点
分别作
的垂线…;
小明同学的思路:如图②,过点B作
,交
延长线于点
…
请你任选一种方法对小王同学的发现进行证明.
是
的弦,在
上作出一点
,使得
;(要求:用直尺和圆规作图,保留作图的痕迹,不写作图步骤.)
中,
平分
,若
,请求出
面积的最大值.
【问题提出】①小王同学发现,三角形中的角平分线还有其他的结论:
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ede962f59496038e45f8f614071adb3.png)
小丽同学的思路;如图①,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d4a832771ba45d407f31000c8fcf37.png)
小明同学的思路:如图②,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a636cdfd6866da11145b09231b46d50e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
请你任选一种方法对小王同学的发现进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8902a0d64b7b8e6a8e55eb037b88c300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0e381a9e21ddfbff452bac86f287c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
更新时间:2024-05-26 20:44:58
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解答题-问答题
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名校
【推荐1】平面直角坐标系中,点A,C分别是x轴和y轴上的动点,
,
.
,
,求点B的坐标;
(2)如图2,设
交x轴于点D,
,若
平分
,求点B的纵坐标;
(3)如图3,当点C运动到原点O时,
的平分线交y轴于点E,
,将
沿
翻折,
的对应边的延长线交
于点G,H为线段
上一点,且
,求
的值.(用含t的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27557ad8d2618454755309fad45cb69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633577f74fd06a4bbcd82a101507f6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c43f704b5d150cb4e29e9796a07d80.png)
(2)如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(3)如图3,当点C运动到原点O时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9c8ef5e0ab50d8f72964dd5277def7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14aeac55d519010de23642ac22cfb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a88657fd651b77585e8c10add921cb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2b9ea2768d285c20f87aeea7634a53.png)
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【推荐2】已知:如图,在△AED中,AD=10cm,∠AED=90°,延长AE到点B,使DE=EB=8cm,过点B作CB⊥AB,CB=2cm,连接CD;点N从点A出发,沿AD方向匀速运动,速度为1cm/s;过点N作NF⊥AE,以DE和EF为邻边作矩形DEFG,点M与点N同时出发,点M从点B沿BA方向匀速运动,速度为1cm/s,连接MN、MD、MC,设运动时间为t(s)(
).解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982645729484800/2983658417709056/STEM/337c2a34-ee3a-4630-bf26-290424fb05d4.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982645729484800/2983658417709056/STEM/a906deff-0ca4-47d8-99f8-73efffb1ec79.png?resizew=152)
(1)当E在线段MF的垂直平分线上时,求t的值;
(2)设四边形MNGD的面积为S(
),求S与t的函数关系式;
(3)在运动过程中,是否存在某一时刻t,使点M在∠DNF的角平分线上,若存在,求出t的值;若不存在,请说明理由.
(4)连接AC,当t=______时,直线MN过线段AC的中点O.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052fc4d2a1d08dc58e6264f32a859f6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982645729484800/2983658417709056/STEM/337c2a34-ee3a-4630-bf26-290424fb05d4.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982645729484800/2983658417709056/STEM/a906deff-0ca4-47d8-99f8-73efffb1ec79.png?resizew=152)
(1)当E在线段MF的垂直平分线上时,求t的值;
(2)设四边形MNGD的面积为S(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
(3)在运动过程中,是否存在某一时刻t,使点M在∠DNF的角平分线上,若存在,求出t的值;若不存在,请说明理由.
(4)连接AC,当t=______时,直线MN过线段AC的中点O.
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解答题-作图题
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【推荐1】如图,在平面直角坐标系
中,一次函数
的图像经过
、
两点.
______,
______.
(2)已知
、
,
①在直线
上找一点P,使
.用无刻度直尺和圆规 作出点P(不写画法,保留作图痕迹);
②点P的坐标为______;
③点Q在y轴上,那么
的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286f8dbaea8439d943bd986a0f4caaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076271898437c71f15453bc809eaccdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dda128fd8bd88de4cdd76739788db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86eb3a8bb2e4d73acebd7712605f3d0.png)
①在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
②点P的坐标为______;
③点Q在y轴上,那么
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18320f2a69e1a8be0d62073f6f9c0b81.png)
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解答题-作图题
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【推荐2】解答题
(1)如图,请你过
的顶点作一条直线
,使得
将
的面积分成相等的两部分(简要说明作图方法);
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953084187426816/2953862216523776/STEM/49c9caba-70ff-4484-bda6-8e117f189794.png?resizew=169)
(2)如图,已知矩形
,若在边
、
上分别存在一点E、F(不含端点)且直线
将矩形
分成面积相等的两部分,画出图形,并探究
和
的数量关系,写出证明过程;
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953084187426816/2953862216523776/STEM/3f18699a-3319-430a-b719-4731962c13b8.png?resizew=201)
(3)如图,王叔叔家有一块四边形菜地
,他打算过D点修一条笔直的小路把四边形菜地
分成面积相等的两部分,分别种植不同的农作物,已知
,
,
,过点D是否存在一条直线将四边形
的面积平分?若存在,求出平分该四边形面积的线段长;若不存在,请说明理由.
(1)如图,请你过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953084187426816/2953862216523776/STEM/49c9caba-70ff-4484-bda6-8e117f189794.png?resizew=169)
(2)如图,已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/2022/4/7/2953084187426816/2953862216523776/STEM/3f18699a-3319-430a-b719-4731962c13b8.png?resizew=201)
(3)如图,王叔叔家有一块四边形菜地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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【推荐3】如图,在平面直角坐标系xoy中,点A的坐标为(0,1),取一点B(b,0),连接AB,作线段AB的垂直平分线
,过点B作X轴的垂线
,记
,
的交点为P.
(1)当b=3时,在图1中补全图形(尺规作图,不写作法,保留作图痕迹).
(2)小慧多次取不同数值b,得出相应的点P,并把这些点用平滑的曲线连接起来,发现:这些点P竟然在一条曲线L上.
①设点P的坐标为(x,y),试求y与x之间的关系式,并指出曲线L是哪种曲线.
②设点P到x轴,y轴的距离分别为
,
,求
+
的范围.当
+
=8时,求点P的坐标.
③将曲线在直线y=2下方的部分沿直线y=2向上翻折,得到一条“W”形状的新曲线,若直线y=kx+3与这条“W”形状的新曲线有4个交点,直接写出k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(1)当b=3时,在图1中补全图形(尺规作图,不写作法,保留作图痕迹).
(2)小慧多次取不同数值b,得出相应的点P,并把这些点用平滑的曲线连接起来,发现:这些点P竟然在一条曲线L上.
①设点P的坐标为(x,y),试求y与x之间的关系式,并指出曲线L是哪种曲线.
②设点P到x轴,y轴的距离分别为
![](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/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
③将曲线在直线y=2下方的部分沿直线y=2向上翻折,得到一条“W”形状的新曲线,若直线y=kx+3与这条“W”形状的新曲线有4个交点,直接写出k的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/10/21/2316823758290944/2318347926691840/STEM/1cce75c20bc44791bab61ab94e2545e2.png?resizew=267)
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解答题-证明题
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【推荐1】如图,在矩形
中,
,
,点
在边
上,
于点
,连接
,
的外接圆
交边
于点
,连接
.
(1)求证:
.
(2)设
,
,
①求
关于
的函数表达式.
②连接
,
,当
与
的一边平行时,求所有满足要求的
的值.
(3)若点
关于
的对称点恰好落在边
上,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.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/16cc20b0d24b7a2f4dcc3d337a76b661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27f1bfc6097776906a259df2e7a6eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c4353e35090ab5f634aff84c9384b8.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c30f73c718bde8352055a14987fc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c398a7d5ff7ddde6fce805e559e3e80d.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9756177ef0c7c685e0fc62077a1cd4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025182429184/2541010959736832/STEM/d9394bd7-b353-457f-a593-0ab8ae60a8f2.png?resizew=254)
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名校
【推荐2】如图①,点
为正方形
内一动点,且
,将
绕点
按顺时针方向旋转
,得到
,连结
,延长
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/85de1cd4-cee5-4fb8-ad56-2e62739388af.png?resizew=374)
(1)求证
.
(2)如图②,若
,请猜想线段
与
的数量关系并加以证明.
(3)如图①,若
,
,求出
的长.
(4)若正方形边长为
,直接写出
的最小值
用含
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b660034355c572fc7c9d89c7bec8e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/85de1cd4-cee5-4fb8-ad56-2e62739388af.png?resizew=374)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dcaa457ac52e1ca8292bdcd8d058682.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae48a456f61464c9bfb16e7f000db3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5277c0885b8761ba66d40f66e7a8aa8.png)
(3)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd9d576c9596ab55839c40a42d63c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc21d04f34e1427744fbfd9db96009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(4)若正方形边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da971671378e8d40e15f5ef0b6e41467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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【推荐1】综合与实践
问题情境
如图,同学们用矩形纸片ABCD开展数学探究活动,其中AD=8,CD=6.
操作计算
(1)如图(1),分别沿BE,DF剪去RtΔABE和RtΔCDF两张纸片,如果剩余的纸片BEDF菱形,求AE的长;
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/d86479c79e954058826d5dd1c03999f6.png?resizew=88)
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/fb313bdcfe1a4c5680c4685c60de3d23.png?resizew=105)
图(1) 图(2) 图(3)
操作探究
把矩形纸片ABCD沿对角线AC剪开,得到ΔABC和
两张纸片
(2)将两张纸片如图(2)摆放,点C和
重合,点B,C,D在同一条直线上,连接
,记
的中点为M,连接BM,MD,发现ΔBMD是等腰三角形,请证明:
(3)如图(3),将两张纸片叠合在一起,然后将
纸片绕点B顺时针旋转a(00<a<900),连接
和
,探究并直接写出线段
与
的关系.
问题情境
如图,同学们用矩形纸片ABCD开展数学探究活动,其中AD=8,CD=6.
操作计算
(1)如图(1),分别沿BE,DF剪去RtΔABE和RtΔCDF两张纸片,如果剩余的纸片BEDF菱形,求AE的长;
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/d86479c79e954058826d5dd1c03999f6.png?resizew=88)
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/7a7d3b26d7e04c6ba27a19131f6fd920.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/e9294033712240b3898b12081515882b.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2018/3/26/1910478030675968/1916605004021760/STEM/fb313bdcfe1a4c5680c4685c60de3d23.png?resizew=105)
图(1) 图(2) 图(3)
操作探究
把矩形纸片ABCD沿对角线AC剪开,得到ΔABC和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f19a79be1354a909bd107924966d5d4.png)
(2)将两张纸片如图(2)摆放,点C和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986a0d8f37177dcccfee3898a66fd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986a0d8f37177dcccfee3898a66fd00.png)
(3)如图(3),将两张纸片叠合在一起,然后将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5142ee3f47fe18a3c98c8ca0303fe46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
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【推荐2】如图①所示,在△ABC中,点O是AC上一点,过点O的直线与AB,BC的延长线分别相交于点M,N.
【问题引入】
(1)若点O是AC的中点,
,求
的值;
温馨提示:过点A作MN的平行线交BN的延长线于点G.
【探索研究】
(2)若点O是AC上任意一点(不与A,C重合),求证:
;
【拓展应用】
(3)如图②所示,点P是△ABC内任意一点,射线AP,BP,CP分别交BC,AC,AB于点D,E,F.若
,
,求
的值.
【问题引入】
(1)若点O是AC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694d114391a3d832e8253aa2dee93dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3258d6203680dbd7949beebce44453b.png)
温馨提示:过点A作MN的平行线交BN的延长线于点G.
【探索研究】
(2)若点O是AC上任意一点(不与A,C重合),求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20810abf03ab7826e5af7aa05afcd0d8.png)
【拓展应用】
(3)如图②所示,点P是△ABC内任意一点,射线AP,BP,CP分别交BC,AC,AB于点D,E,F.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae42af16641c73d6a779f4dd793a3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df505ba13219c11863607b757cbe61a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970496276d831126182e9403a4f547eb.png)
![](https://img.xkw.com/dksih/QBM/2017/10/11/1799325556523008/1810184972754944/STEM/3b0555fab2a34754958a300c04940fe2.png?resizew=326)
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