(1)如图1,在△ABC的外部,分别以AC,BC为边,作等边三角形△ACE和等边三角形△BCD,连接AD,BE,相交于点F.
①求证:△ACD≌△ECB;
②求∠AFB的度数;
(2)如图2,在
中,
,在
的外部以BC为边,作等边三角形△BCD,连接AD,当AB=8,请直接写出AD长的最大值为 ;
(3)如图3,在△ABC中,当AB=8,AC=3BC时,请直接写出
面积的最大值为 .
①求证:△ACD≌△ECB;
②求∠AFB的度数;
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
(3)如图3,在△ABC中,当AB=8,AC=3BC时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730009811173376/2730984393023488/STEM/5c903607-ea09-453f-8967-d41cec4544bb.png?resizew=500)
更新时间:2021-05-28 21:04:52
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解答题-问答题
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较难
(0.4)
【推荐1】已知抛物线
,抛物线
,a是常数且
.在平面直角坐标系中抛物线
和抛物线
合起来的图形记作G.
(1)若点
在图像G上,则
___________;
(2)在(1)的条件下,当
时,求图像G的最大值与最小值的差;
(3)用含a的代数式分别表示抛物线
和抛物线
的顶点坐标;
(4)当图像G上的点到直线
的距离为2的点恰有3个时,直接写出a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1830f9c65e9ee444d4835d384660c86b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070f279d0b0b0dd0b69ff97b86abd5d3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc265a5df593ef1128504538c575e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b6dab105ef5caf08a9fffeb8d6e55.png)
(3)用含a的代数式分别表示抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(4)当图像G上的点到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32fca7406493e4e31c5b8e0c86c60f9.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图,在平面直角坐标系中,抛物线
交
轴于点
,交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/c60b4936-91fb-405c-8dbe-ff8188bc52c3.png?resizew=252)
(1)求
的面积.
(2)
为抛物线的顶点,连接
,点
为抛物线上点
、
之间一点,连接
、
,过点
作
交直线
于点
,连接
,求四边形
面积的最大值以及此时
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9ca095c086211e4b676d3a948d046a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/c60b4936-91fb-405c-8dbe-ff8188bc52c3.png?resizew=252)
(1)求
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(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-问答题
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较难
(0.4)
【推荐1】在正方形
中,动点
,
分别从
,
两点同时出发,以相同的速度在直线
,
上移动.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723582496137216/2729196794830848/STEM/1bac4492-fcb9-495c-bead-ff226cf95fb0.png)
(1)如图1,当点
在边
上自
向
移动,同时点
在边
上自
向
移动时,连接
和
交于点
,请你直接写出
与
的关系.
(2)如图2,当
,
分别在边
,
的延长线上移动时,连接
,
,
,当
为等腰三角形时,求
的值.
(3)如图3,当点
在边
上自
向
移动,同时点
在边
上自
向
移动时,连接
和
交于点
,由于点
,
的移动,使得点
也随之运动.若
,求线段
的最小值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7ee68fd38a7e3d715950f692ae700b.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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解答题-作图题
|
较难
(0.4)
【推荐2】如图,在每个小正方形的边长为1的网格中,
的顶点
,
均在格点上,顶点
在网格线上,
.
![](https://img.xkw.com/dksih/QBM/2022/12/26/3139282834907136/3140811499552768/STEM/afb2d1d66f9c4b5ea58886776bc21395.png?resizew=134)
(1)线段
的长等于
(2)
是如图所示的
的外接圆上的动点,当
时,请用无刻度的直尺,在如图所示的网格中画出点
,并简要说明点
的位置是如何找到的(不要求证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a631226b2177fd5ef032b5767c9b3b5.png)
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(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b7850101b28bed272a21232dfcef33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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