如图,在
中,P是
的中点,
于点D,
于点E,且
,求证:
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374e2198b495b86b0f8308d28035a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2024-03-11 11:47:33
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解答题-证明题
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【推荐1】已知在△ABC中,∠CAB的平分线AD与BC的垂直平分线DE交于点D,DM⊥AB于M,DN⊥AC的延长线于N.
(1)证明:BM=CN.
(2)当∠BAC=70°时,求∠DCB的度数;
(3)若AB=8,AC=4,DE=3,则4DN2﹣BC2的值为 .
(1)证明:BM=CN.
(2)当∠BAC=70°时,求∠DCB的度数;
(3)若AB=8,AC=4,DE=3,则4DN2﹣BC2的值为 .
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859401619595264/2859672670224384/STEM/155067007040492d96b909d19a25537d.png?resizew=184)
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【推荐2】我们在学习数学的过程中,常常需要联想、类比、迁移.请先认真阅读材料,再解决问题.(材料中问题无需作答 ).
【阅读材料】
如图1,
平分
,点P为
上一点,
两边分别交
于点C、D,且
,求证:
;
【解决问题】
如图2,在菱形
中,
,对角线
相交于点O,点E在对角线
上,连接
.只用圆规 在射线
上作点F,使
,简要说明作法并根据你的做法证明
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/e997252a-f74b-4274-9923-09b7150fd525.png?resizew=406)
【阅读材料】
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc0072cfd780e29addd10e8cc2f2642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47ddc7c9fb41942160e3cafcf756776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fd6da28b7c1097a2308adba675c154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
证明思路: 过点P作 ![]() 根据 ![]() ![]() ![]() 再证明 ![]() ![]() |
如图2,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c4c6d8bd5fcb73cb096e7a8182285a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c4c6d8bd5fcb73cb096e7a8182285a.png)
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【推荐1】(1)如图①,将矩形纸片
沿对角线
折叠,使点B落在点
处,
与
交于点E,求证:
是等腰三角形;
(2)点O是矩形纸片
对角线的交点,将该纸片沿过点O的线段
折叠,使点A的对应点为
,点B与点D重合,连接
,求证:四边形
是菱形;
![](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/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/03822853-9c47-4159-94de-bd9d9769d984.png?resizew=338)
(2)点O是矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2283590c7c41c5e9a294fa73bc549d63.png)
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【推荐2】在学完矩形的判定后,善于钻研的小壮、小刚和小强同学有自己独到的见解:
已知:如图,四边形
中,
,对角线
、
相交于点O,
.
小壮说:若
,则四边形
为矩形;
小刚说:若
,则四边形
为矩形.
小强说:若
,则四边形
为矩形.
请对三人的说法任选其一进行判断并证明.
已知:如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
小壮说:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
小刚说:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f90318c1a8d868d69fba0e8ab960bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
小强说:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09c7dd1600eee571c32611ca39880ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
请对三人的说法任选其一进行判断并证明.
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