如图,正方形
和正方形
中,点D在
上,连接
,H是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/55ad3a51-6f2b-4960-b423-329d3b68c363.png?resizew=184)
(1)连接
,若
,求
的面积;
(2)判断点H是否为直线
的交点?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/55ad3a51-6f2b-4960-b423-329d3b68c363.png?resizew=184)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4576b2d5b9b1599eb990e5523d9230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
(2)判断点H是否为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1058655e6ba9631248d10f3d5b8babe6.png)
更新时间:2023-10-28 13:09:34
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,点
是
内一点,连结
、
,并将
、
、
、
的中点
、
、
、
依次连结,得到四边形
.
(1)求证:四边形
是平行四边形;
(2)若
为
的中点,
,
和
互余,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/b2257da1e2425f2ea9ac7440f52659ff.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d958f5219b501284e1554d9a8aec3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c3ca226db5d490fa92bb1b7c8deb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b2fb47382e76af829559a75b48fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715794547146752/2721039967059968/STEM/16e6c8c9-deb6-4142-bf7d-82771eba7889.png)
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解答题-证明题
|
适中
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【推荐2】如图,在矩形
中,
,
为
边上的中线,且
,
.
(1)求证:四边形
是菱形;
(2)若
,求五边形
的周长(结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7cefa14a90337bbbb6e378d8a892d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eddb32e1d8bab4a0a43d7da9f73c1ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/4e852897-301d-4c34-9493-cd6fc1171c5c.jpg?resizew=166)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7a4b211dce9114bbe1db4941a4fe2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81ef072099b96878b73f692012eb84c.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,
为直径,点B,D在
上,且
,作
于点E,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/09f82121-f5d2-404b-a625-da557ca2d732.png?resizew=147)
(1)求点D到直线
的距离;
(2)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/09f82121-f5d2-404b-a625-da557ca2d732.png?resizew=147)
(1)求点D到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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【推荐2】如图,直线l经过正方形ABCD的顶点A,分别过正方形的顶点B,D作
于点E,
于点F.已知
,
,求正方形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72d26eae9a5470ac982541c609b109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45b0edca4e802b8d4548dce6f1b0a77d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3966b4dba5e005344ece308fe7166799.png)
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解答题-作图题
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名校
【推荐3】在数学课上,老师说统计学中常用的平均数不是只有算术平均数一种,好学的小聪通过网络搜索,又得到了两种平均数的定义,他把三种平均数的定义整理如下:
对于两个数a,b,
称为a,b这两个数的算术平均数,
称为a,b这两个数的几何平均数,
称为a,b这两个数的平方平均数.
小聪根据上述定义,探究了一些问题,下面是他的探究过程,请你补充完整:
(1)若a = -1,b = -2,则M = ,N = ,P = ;
(2)小聪发现当a,b两数异号时,在实数范围内N没有意义,所以决定只研究当a,b都是正数时这三种平均数的大小关系.结合乘法公式和勾股定理的学习经验,他选择构造几何图形,用面积法解决问题:
如图,画出边长为a+b的正方形和它的两条对角线,则图1中阴影部分的面积可以表示N2.
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759898398375936/2761355669725184/STEM/dbfcd706e2e24104a6772af97f900cac.png?resizew=106)
①请分别在图2,图3中用阴影标出一个面积为M2,P2的图形;
②借助图形可知当a,b都是正数时,M,N,P的大小关系是: (把M,N,P从小到大排列,并用“<”或“≤”号连接).
对于两个数a,b,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f328cf215fdb308f3e50b1041866651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5c7b28bfd46f711ad03772566dc07d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97bf9f5cd38e22dcdd2fbf5b6ae6967f.png)
小聪根据上述定义,探究了一些问题,下面是他的探究过程,请你补充完整:
(1)若a = -1,b = -2,则M = ,N = ,P = ;
(2)小聪发现当a,b两数异号时,在实数范围内N没有意义,所以决定只研究当a,b都是正数时这三种平均数的大小关系.结合乘法公式和勾股定理的学习经验,他选择构造几何图形,用面积法解决问题:
如图,画出边长为a+b的正方形和它的两条对角线,则图1中阴影部分的面积可以表示N2.
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759898398375936/2761355669725184/STEM/75357409b08b494cbcef40380bed6406.png?resizew=106)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759898398375936/2761355669725184/STEM/93dd3d027f6f41408d6edefaae685adb.png?resizew=106)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759898398375936/2761355669725184/STEM/dbfcd706e2e24104a6772af97f900cac.png?resizew=106)
①请分别在图2,图3中用阴影标出一个面积为M2,P2的图形;
②借助图形可知当a,b都是正数时,M,N,P的大小关系是: (把M,N,P从小到大排列,并用“<”或“≤”号连接).
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在正方形
中,
,E为
中点,连接
,将
沿
折叠,点B的对应点为G,连接
并延长交
于点F,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/5b30ac2b-85db-4e7a-abdc-0954898dc4f9.png?resizew=150)
(1)判断
与
的位置关系,并说明理由;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/5b30ac2b-85db-4e7a-abdc-0954898dc4f9.png?resizew=150)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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适中
(0.65)
【推荐2】已知:如图,在正方形ABCD,E是BC边上一点,F是CD的中点,且AE = DC + CE. 求证:AF平分∠DAE.
![](https://img.xkw.com/dksih/QBM/2018/8/3/2002667503362048/null/STEM/a18d5f599cd54f1083aff450efdef7bc.png?resizew=154)
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