如图,
为
的中位线,点
在
上,且
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243a9ae75886b75c37f88a0ba655fa31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f4df396aed4f14cc52af86141eff1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2024-05-20 14:28:16
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】【探究与证明】如图,在四边形
中,对角线
与
相交于点O,记
的面积为
,
的面积为
.
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3682afa5e3e71971c82d35c98a6146.png)
小红同学展示出如下正确的证明办法,请在横线上将内容补充完整.
证明:过点D作
交
于点E,过点B作
交
于点F,如图①所示:则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d56a03d21943559c3ec5d01beed973.png)
∴
____________
(填写位置关系)
∴
____________;
∴
____________;
∵
;
;
∴
.
(2)【探索推广】如图②,若
与
不平行,(1)中的结论是否成立?若成立,请证明;若不成立,请说明理由.
(3)【拓展应用】如图③,在
上取一点
,使
.过点
作
交
于点
,点
为
的中点,
交
于点
,且
,若
,求
值.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3682afa5e3e71971c82d35c98a6146.png)
小红同学展示出如下正确的证明办法,请在横线上将内容补充完整.
证明:过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d56a03d21943559c3ec5d01beed973.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b06ed283116db8ab2a1a254724226175.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48acf06b38de34c9d3d9562712b0a0ec.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e49d7d94bdef2c89cd1bd2992e43d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a919108801acc6b42f99dbf223e4475e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bb6a453a3ccba3c36269b1b2e60240.png)
(2)【探索推广】如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)【拓展应用】如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb43a62f3bfd7666ab898bcb5efc1ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d51083cf65d74e2856c9755c1ebaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af28f52ccef42710bfb647db4f2f0f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知在△ABC中,AC=5,BC=12,AB=13,点E是边AB上一动点,EF⊥AC于点F,ED⊥BC于点D,点G为FD的中点.
(1)求证:四边形CDEF是矩形
(2)当点E由点A运动到点B时,求点G的运动路径长.
(1)求证:四边形CDEF是矩形
(2)当点E由点A运动到点B时,求点G的运动路径长.
![](https://img.xkw.com/dksih/QBM/2021/4/12/2698248639135744/2700146937937920/STEM/f6ad7b61-c236-42e1-b526-f67f9e63bb3e.png?resizew=390)
您最近一年使用:0次
解答题-作图题
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适中
(0.65)
【推荐1】已知:如图,在边长为4的正方形ABCD中,点F是边DC的中点,连接AF,并将线段AF绕点A顺时针旋转90°得到线段AE,连接EF,取EF的中点G,连接CG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/881a4461-0647-497c-a084-95b0f262a284.png?resizew=137)
(1)请根据题意补全图形;
(2)求线段CG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/881a4461-0647-497c-a084-95b0f262a284.png?resizew=137)
(1)请根据题意补全图形;
(2)求线段CG的长.
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,△ABC中,AD是高,CE是中线,点G是CE的中点,DG⊥CE,点G为垂足.
(1)求证:DC=BE;
(2)若∠AEC=75°,求∠BCE的度数.
(1)求证:DC=BE;
(2)若∠AEC=75°,求∠BCE的度数.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849920818577408/2851168451575808/STEM/6764b21d789142bbbe006ba75f0e3ff2.png?resizew=131)
您最近一年使用:0次