已知
中
.
(1)如图1、2,若点
是
上一点,且
,点
是
上的动点,将
沿
对折,点
的对应点为
(点
和点
在直线
的异侧),
与
交于点
.
①当
时,求
的度数.
②当
是等腰三角形时,求
的度数.
(2)如图3,若点
是
上一点,且
,
是线段
上的动点,以
为直角构造等腰直角
(
三点顺时针方向排列),在点
的运动过程中,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bf08a9a086be40a3ae60ab6beaf135.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/2bab5345-4b2a-4fc0-90b7-7c86165972f2.png?resizew=505)
(1)如图1、2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.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/abe4bdc5d9e833b23a1b916c06fc1a35.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/1dd00c7cbe7c110566725ec91dcc2f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dd00c7cbe7c110566725ec91dcc2f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55aad1988dc848a229f46516ebd87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49645326ab0be513ee17a6200b905e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5686730a081427d27fdc45997eca9c.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f719fe8041f1c58e3603c21529db6121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
(2)如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00318e66c90301e07c6db0914d2865b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a54e7b35c73ee578c4d01479ddb74cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40a35b23a4d83974716e53b334e7c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d63279a231f5e49d46d289a675dc5d7.png)
更新时间:2023-09-01 15:22:12
|
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解答题-问答题
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【推荐1】已知∠MON = 50°,OE 平分∠MON,点A、B、C分别是射线OM、OE、ON上的动点(A、B、C不与点O重合),连接AC交射线OE于点D、设∠OAC = x°.
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解答题-问答题
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【推荐2】如图,在
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解答题-证明题
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【推荐1】如图1,AE与BD相交于点C,AC=EC,BC=DC.
(1)求证:AB
DE;
(2)如图2,过点C作PQ交AB于P,交DE于Q,求证:CP=CQ.
(3)如图3,若AB=4cm,点P从点A出发,沿A→B→A方向以3cm/s的速度运动,点Q从点D出发,沿D→E方向以1cm/s的速度运动,P、Q两点同时出发.当点P到达点A时,P、Q两点同时停止运动.设点P的运动时间为t(s).连接PQ,当线段PQ经过点C时,直接写出t的值为 .
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(2)如图2,过点C作PQ交AB于P,交DE于Q,求证:CP=CQ.
(3)如图3,若AB=4cm,点P从点A出发,沿A→B→A方向以3cm/s的速度运动,点Q从点D出发,沿D→E方向以1cm/s的速度运动,P、Q两点同时出发.当点P到达点A时,P、Q两点同时停止运动.设点P的运动时间为t(s).连接PQ,当线段PQ经过点C时,直接写出t的值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/ca70651a-e031-43f4-b256-2bfb7851cbbb.png?resizew=529)
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【推荐2】如图,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab083b4fd82749bcf218be6131baac63.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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(2)某数学兴趣小组,采用数形结合思想解决了如下问题:
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,
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(2)某数学兴趣小组,采用数形结合思想解决了如下问题:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633903905db0dc1858ea86af3a19d815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334275666797e049f7e26afa880cc6d4.png)
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