如图,在
中,点E,F分别在BC,AD上,
,
.
(1)求证:四边形
是矩形;
(2)若四边形
为菱形,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/9c0ce3bc-245d-4b30-90d2-11af896a14a8.png?resizew=149)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025df2a9934b457cf20d91604e430612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f7d9f5e71bfef8188b1216c1276c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2023-10-19 08:02:31
|
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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】如图,C是线段AB上一个动点,且△ACD,△BCE都是等边三角形,M,N分别是CD,BE的中点,AB=4,设AC=x.
(1)BN= (用含x的代数式表示);
(2)线段MN的最小值为 .
(1)BN= (用含x的代数式表示);
(2)线段MN的最小值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/87180614-635f-460e-b4f8-f99a21158673.png?resizew=158)
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【推荐2】如图,在
中,
,
,
,点
是边
上的动点
点
不与
,
重合
,过点
作
于
,过点
作
,交
于点
,连接
,设
的长度为
.
;
(2)若存在一点
,使得四边形
为平行四边形,求出此时
的值;
(3)若四边形
的面积为
,请用
的表达式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce08128582a7e855852c03e0ac5d0487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/ac8c94316312f093ebfc80b872a83c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fda6d76fb350332472e76fefcca6a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb54891f6161ef7a0e627619cc80b0e.png)
(2)若存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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解答题-证明题
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【推荐1】如图,在菱形
中,对角线
,
交于点
,延长
到点
,使得
.连接
.过点
作
,交
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/fb6fb7b8-a393-459a-8a2b-b3f16ec28a20.png?resizew=309)
(1)求证:四边形
是矩形;
(2)若
,
,求
的长
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe446a0456e9168028baee032d8d7d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/fb6fb7b8-a393-459a-8a2b-b3f16ec28a20.png?resizew=309)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75767b8b80cc1461a1addf2d308883c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
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解答题-证明题
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适中
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【推荐2】如图,在
中,各内角的平分线分别相交于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/6089d5e2-39d0-4726-a4af-a5389b699da6.png?resizew=225)
(1)求证:
;
(2)猜一猜,四边形
是什么样的特殊四边形?证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/6089d5e2-39d0-4726-a4af-a5389b699da6.png?resizew=225)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec305c24ce31989a4d2c80f3bb6d75.png)
(2)猜一猜,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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【推荐1】如图,矩形EFGH的顶点E,G分别在菱形ABCD的边AD,BC上,顶点F,H在菱形ABCD的对角线BD上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/ea621e26-6dc4-4e08-8cf3-addac9a6ec6a.png?resizew=194)
(1)求证
;
(2)若E为AD的中点,
.
①求菱形ABCD的边长;
②若
,求菱形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/ea621e26-6dc4-4e08-8cf3-addac9a6ec6a.png?resizew=194)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b555a0bb6b5132ecfb9cae3769912c3.png)
(2)若E为AD的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05529d5906c6873231d138127bc9e2d9.png)
①求菱形ABCD的边长;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
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解答题-证明题
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(0.65)
【推荐2】已知:如图,在菱形ABCD中,点E,F分别是AB、AD上的动点(不与菱形的顶点重合).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/f86a8e56-87c6-48dc-9493-516de5077d3b.png?resizew=333)
(1)现有3个选项:①
,②△FCE是等边三角形,③
.请从3个选项中选择两个作为条件,余下的一个作为结论,得到一个真命题,并证明其正确性.
你选择的两个条件是 .结论是 (只要填写序号)
(2)在(1)的条件下,若菱形ABCD的边长为4cm,点E由B→A以1cm/s的速度运动,设运动的时间为
,则△FEA面积的最大值是 cm2(直接写出答案).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/f86a8e56-87c6-48dc-9493-516de5077d3b.png?resizew=333)
(1)现有3个选项:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784d093b48df0ba4ae15ea1368fe85e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97075fe3c2a105f5d2d0a27a9f2b3410.png)
你选择的两个条件是 .结论是 (只要填写序号)
(2)在(1)的条件下,若菱形ABCD的边长为4cm,点E由B→A以1cm/s的速度运动,设运动的时间为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2609bd4ecadb3383e33a0250794dc8c.png)
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