阅读材料:如图(1),在
中,
,点P在
边上,
于点
于点F,则
.(此结论不必证明,可直接应用)
如图(2),正方形
的边长为2,对角线
相交于点O,点P在
边上,
于点
于点F,则
______;
(2)【类比与推理】
如图(3),矩形
的对角线
相交于点
点P在
边上,
交
于点E,
交
于点F,求
的值;
(3)【拓展与延伸】
四边形
是半径为4的圆内接四边形,对角线
相交于点O,
,点P在弦
上,
交BD于点E,
交
于点F,当
时,试判断
的值是否为定值,若是请求出该定值并求出四边形
面积的最大值;若不是定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336496362282a03b805c4d14b823308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0bfd5c0506342a0127b9d0a1ed9601.png)
如图(2),正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1c2a266873044e21dd02c9f7e4e0e0.png)
(2)【类比与推理】
如图(3),矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32ff7566dfbf1d22bf693f825d83ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7681c103bfed97988a516065d1c7d91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb754e9542819c137b4c049c5cff66aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
(3)【拓展与延伸】
四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cc1c481e243ca311a6369c8313a18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d60f55c585f1b455027202684b13e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2103beb858805577d9402209c518828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c4cfb55d68dfc47530b4604f63d69c.png)
更新时间:2024-04-20 18:05:56
|
相似题推荐
解答题-计算题
|
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【推荐1】问题提出:
(1)如图①,在
中,
,
,
,则
的面积为______;
(2)如图②,在四边形ABCD中,
,
,
,
,点M,N分别为边CB,CD上两动点,且
,连接AM,AN,试说明四边形AMCN的面积是定值;
问题解决:
(3)如图③是一块平行四边形空地,其中
,
,
,点M,N分别为边CB,CD上两点,且
,连接AM,MN,AN.公司规划在
区域修建一座购物商城,在
区域修建一个顾客休息中心,在
区修建小吃城,最后中间
区域进行绿化.公司为了利益最大化,绿化面积即
的面积尽可能小.请你计算出绿化面积的最小值和CM的长度.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图②,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fb581e6a89ae40731b8619fff1e173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed0c20ed7142bf8ed780864660f4562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1936b8f07c6ac07855181115bc6f073c.png)
问题解决:
(3)如图③是一块平行四边形空地,其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041cb52f2491fc4d3cb32063d0e116b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8df3ca5cf10137e5c123d37c214aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8416024905bcddfd726de5629763778c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20d576d3824eaf583c67809124c6327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/f551f969-3d05-4e37-a1f4-6604473f544f.png?resizew=555)
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【推荐2】计算下列各题
某广告公司设计一幅周长为16米的矩形广告牌,广告设计费为每平方米2000元,设矩形一边长为
,面积为
平方米.
(1)求
与
之间的函数关系式,并写出自变量
的取值范围;
(2)设计费能可以达到30000元吗?为什么?
(3)当
是多少米时,设计费最多?最多是多少元?
某广告公司设计一幅周长为16米的矩形广告牌,广告设计费为每平方米2000元,设矩形一边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)设计费能可以达到30000元吗?为什么?
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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名校
【推荐1】我们知道,平行四边形的对边平行且相等.利用这一性质,可以为证明线段之间的位置关系和数量关系提供帮助.
重温定理,识别图形
(1)如图①,我们在探究三角形中位线DE和第三边BC的关系时,所作的辅助线为“延长DE到点F,使EF=DE,连接CF”,此时DE与DF在同一直线上且DE=
DF,又可证图中的四边形 为平行四边形,可得BC与DF的关系是 ,于是推导出了“DE
BC,DE=
BC”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/bd77cd2c-5dae-4cb5-aa14-f616872f42a4.png?resizew=259)
寻找图形,完成证明
(2)如图②,四边形ABCD和四边形AEFG都是正方形,△BEH是等腰直角三角形,∠EBH=90°,连接CF、CH.求证CF=
BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/47a7dafa-6be1-4cf8-911e-2f4bc082cb80.png?resizew=166)
构造图形,解决问题
(3)如图③,四边形ABCD和四边形AEFG都是菱形,∠ABC=∠AEF=120°,连接BE、CF.直接写出 CF与BE的数量关系.
重温定理,识别图形
(1)如图①,我们在探究三角形中位线DE和第三边BC的关系时,所作的辅助线为“延长DE到点F,使EF=DE,连接CF”,此时DE与DF在同一直线上且DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/bd77cd2c-5dae-4cb5-aa14-f616872f42a4.png?resizew=259)
寻找图形,完成证明
(2)如图②,四边形ABCD和四边形AEFG都是正方形,△BEH是等腰直角三角形,∠EBH=90°,连接CF、CH.求证CF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/47a7dafa-6be1-4cf8-911e-2f4bc082cb80.png?resizew=166)
构造图形,解决问题
(3)如图③,四边形ABCD和四边形AEFG都是菱形,∠ABC=∠AEF=120°,连接BE、CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/95bff706-271d-4179-801f-e256aa0aeb6b.png?resizew=225)
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【推荐2】正方形
对角线
,
相交于点
,
为线段
上一点,连接
.
,
,求
的长度;
(2)如图2,
为
上一点,连接
,
为
上一点,连接
,
,若
,
,
,求证:
;
(3)如图3,若正方形
边长为
,延长
交
于
,在
上截取
,连接
交
于
,连接
交
于
,连接
,直接写出
的最小值.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae03ea239405994d1b6f20d15a36f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa138522a8436e5c120ef0856c2797c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6642cdb0bc02c08a6e46dda5fd5b4db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343f75b2c5479c279abca2faed278901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62cd09b8fe4b0543a4f8f0ea1e75a29.png)
(3)如图3,若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e87e323066922a1e3222f8d40d870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
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【推荐1】已知,
和
都是等边三角形.
(1)如图1,连接
,求证:
;
(2)如图2,若点D,E,C在一条直线上,点D,E在边
的上方,
与
交于点F,
,
,求
的值.
(3)将
绕点B沿顺时针方向旋转,使点D在
上,过点D作
,
与直线
交于点F,若
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/692dbbed-603c-4bac-8418-edc5e045e67d.png?resizew=313)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408c785bce57b8ce113b28e8f16fc2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
(2)如图2,若点D,E,C在一条直线上,点D,E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddb339df743a4f0347823beee5516b6.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07169553ee5d0a014a8dd05ab231c1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
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【推荐2】【特例感知】
(1)如图①,
是
的直径,
是
的圆周角,
平分
交
于点D,连接
.已知
,
,则
的度数为
,点D到直线
的距离为 ;
【类比迁移】
(2)如图②,
是
的圆周角,
平分
交
于点D,过点D作
,垂足为M,探索线段
之间的数量关系,并说明理由;
【问题解决】
(3)图③,四边形
为
的内接四边形,
,
平分
,
,求线段
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/cc7bf1c2-9b11-4a9a-9710-41b081538a58.png?resizew=382)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8675339af8e4efed96e57f60cd6c3b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4dbea6a5faecdd8f6c06cf9fd43a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【类比迁移】
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7ad8d177fc4dcb983c5952ad5533b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fda42fb39fba007b3017c19e3cd2b28.png)
【问题解决】
(3)图③,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa45e8ff80b726b1daf611e23eb85ec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41f8d1058d8f4f902a84fc29a7e2fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图
,在
中,
,
,
,如果点
由点
出发沿
方向向点
匀速运动,同时点
由点
出发沿
方向向点
匀速运动,它们的速度均为
,连接
,设运动时间为
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/94c3df3b-df60-4623-b80c-5306241f0e53.png?resizew=280)
(1)用含
的代数式表示
______,
______;
(2)设
的面积为
,当
为何值时,
取得最大值,
的最大值是多少?
(3)如图
,连接
,将
沿
翻折,得到四边形
,当四边形
是菱形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f9fc63aeaac7f7e359f1bcd734a90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a81d63da32eb9501a0099ee7fd8df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8736fe00b3d7c0ab2524c883df78d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/94c3df3b-df60-4623-b80c-5306241f0e53.png?resizew=280)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbc9c4e4db6374d5ba4c5dec8747442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51ece6bb53c3f5bf2da7d9ee5960e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c534c83cd0bd3ca49ad2a83fb17fed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c534c83cd0bd3ca49ad2a83fb17fed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在
中,
,
,点D是
上一点,点E在
的延长线上,且
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/16c18041-9772-4a1e-9974-af5feb0d6331.png?resizew=645)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ede9d752199cc588443e6cb58c6e0c.png)
(2)若
,过点B作
于点M,求
的值.(用含k的代数式表示)
(3)如图2,将
沿
翻折得到
,连接
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdaf297101d00130986a3a455f4c252b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/16c18041-9772-4a1e-9974-af5feb0d6331.png?resizew=645)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ede9d752199cc588443e6cb58c6e0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d78804cb7c304d7aedee23d69635d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb350b8e577a7b6712031a3b5b98309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf79c9b6d16e7e4eb0b8a7efb37dabb.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
您最近一年使用:0次