已知:如图,在
中,
平分
,交
于E,
平分
,交
于F.
![](https://img.xkw.com/dksih/QBM/2024/3/6/3447878807666688/3448489205334016/STEM/eb395ddb18764e3883a7233b0865151f.png?resizew=202)
(1)求证:
;
(2)当
与
满足什么关系时,四边形
是矩形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2024/3/6/3447878807666688/3448489205334016/STEM/eb395ddb18764e3883a7233b0865151f.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
更新时间:2024-03-07 21:15:52
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解答题-问答题
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适中
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名校
【推荐1】已知二次函数
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(1)该二次函数的顶点坐标为__________;
(2)该函数的图象与
轴的交点坐标为__________;
(3)用五点法画函数图象
(4)当
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(5)将该抛物线绕顶点旋转180°,所得函数的解析式为__________;
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… | … | ||||||
… | … |
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(5)将该抛物线绕顶点旋转180°,所得函数的解析式为__________;
(6)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7401e33cefaa272808954d1d6f1190ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】已知,△ABC和△DBC的顶点A和D在BC的同旁,AB=DC,AC=DB,AC和DB相交于点O.求证:OA=OD.
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【推荐1】如图,等腰
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(1)求证:
.
(2)连接
、
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;
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)求证:
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(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb59ddf4f442f20767fb6d894a8f7c.png)
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【推荐2】已知:如图,在
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解答题-证明题
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适中
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【推荐1】四边形
为平行四边形,
为对角线,
垂直平分
交边
于点
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(1)如图1,求证:四边形
是菱形;
(2)如图2.若
是
的中点,在不添加任何辅助线的情况下,请直接写出图中与四边形
面积相等的所有三角形和四边形(四边形
除外).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/bc667972-ae24-4c4b-9b2d-7338ac4da034.png?resizew=350)
(1)如图1,求证:四边形
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(2)如图2.若
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真题
名校
【推荐2】如图,在
中,
的平分线
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(1)求证:
;
(2)当
时,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7e48723871f06a6aeae31a2a1ff79d.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a24b71f64937b1848900d850372e1a.png)
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【推荐1】已知:如图,D是△ABC的边AB上一点,CN∥AB,DN交AC于点M,MA=MC.
①求证:CD=AN.
②若∠AMD=50°,当∠MCD= °时,四边形ADCN是矩形.
①求证:CD=AN.
②若∠AMD=50°,当∠MCD= °时,四边形ADCN是矩形.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2204948143538176/2207906083037184/STEM/b7945209a75c4f0781c46702ab52a6ed.png?resizew=185)
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适中
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【推荐2】如图,在
中,点D是
的中点,点E是
边的中点,过点A作
交
的延长线于点F,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/333f2083-283e-4a55-bd82-ec6511fb02c5.png?resizew=183)
(1)求证:
;
(2)当
满足什么条件时,四边形
为矩形,并说明理由.
(3)当
满足 时,四边形
为正方形,不需要说明理由.
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(1)求证:
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(2)当
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(3)当
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