题型:解答题-问答题
难度:0.15
引用次数:104
题号:22922803
(1)发现:如图①所示,在正方形
中,
为
边上一点,将
沿
翻折到
处,延长
交
边于
点.求证:
;
(2)探究:如图②,在矩形
中,
为
边上一点,且
,
,将
沿
翻折到
处,延长
交
边于点
,延长
交
边于点
,且
,求
的长.
(3)拓展:如图③,在菱形
中,
,
为
边上的三等分点,
,将
沿
翻折得到
,直线
交
于点
,直接写出
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c174f6e357b0650d813585e5641edb22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34e6aefafaaf7a75883e880b6ef275d.png)
(2)探究:如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f46b6b3841a2e590438cdf030dd81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展:如图③,在菱形
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
更新时间:2024-05-24 07:59:36
|
相似题推荐
解答题-计算题
|
困难
(0.15)
名校
【推荐1】【问题提出】
(1)如图①,已知在四边形
中,
,对角线
与
相交于点
,则
________
(填“
”“
”或“
”).
【问题探究】
(2)如图②,在
中,
,
,
,点
、点
分别为
、
边上的两个点,连接
、
,过点
作
,交
于点
,连接
,若
恰好将
分为面积相等的两部分,求
的长.
【问题解决】
(3)杨叔叔承包了一块土地欲进行耕种,土地形状如图③所示,其中四边形
的面积为12600 平方米,
,
米,
米,
,
所在圆的半径为65米.已知
的中点
处有一口灌溉水井,现结合实际耕种需求,需在
上找一点
,使
将这块土地的面积分为相等的两部分,用于耕种两种不同的作物,并沿
修一条灌溉水渠(水渠的宽度忽略不计),请在图中找出点
的位置,并计算灌溉水渠
的长.(结果保留根号)
(1)如图①,已知在四边形
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29aa828f2bd9a5e63ee58dcaa9d0d336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a983aae27f2b9b80b172a29f5a293d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
【问题探究】
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b587195649cc10f47cc2dfc7018d0527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【问题解决】
(3)杨叔叔承包了一块土地欲进行耕种,土地形状如图③所示,其中四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761c99864d760bffd0b4f4f677985aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e38e804c0d3e6caaffdd6534177769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f1d13280f448c367ef6fe172a3f8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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解答题-作图题
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困难
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解题方法
【推荐2】如图,在
中,
,点
到
两边的距离相等,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571ef38fc225d102bcd4f35bab70078c.png)
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733574897639424/1734173965754368/STEM/754390797e1948a69062032d75a91da4.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733574897639424/1734173965754368/STEM/592f290665eb4191ad452047627fdb3c.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733574897639424/1734173965754368/STEM/ad3f2395517947b88e0e1ebafbb1d4f6.png?resizew=63)
(1)先用尺规作出符合要求的点(保留作图痕迹,不需要写作法),然后判断△ABP的形状,并说明理由;
(2)设,
,试用
、
的代数式表示
的周长和面积;
(3)设与
交于点
,试探索当边
、
的长度变化时,
的值是否发生变化,若不变,试求出这个不变的值,若变化,试说明理由.
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733574897639424/1734173965754368/STEM/a87589d980314f17af7d4688c9a87867.png?resizew=198)
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解答题-问答题
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困难
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【推荐3】问题提出
在综合与实践课上,某数学研究小组提出了这样一个问题:如图1,在边长为4的正方形
的中心作直角
,
的两边分别与正方形
的边
,
交于点E,F(点E与点B,C不重合),将
绕点O旋转.在旋转过程中,四边形
的面积会发生变化吗?
爱思考的浩浩和小航分别探究出了如下两种解题思路.
浩浩:如图a,充分利用正方形对角线垂直、相等且互相平分等性质,证明了
,则
,
.这样,就实现了四边形
的面积向
面积的转化.
小航:如图b,考虑到正方形对角线的特征,过点O分别作
于点G,
于点H,证明
,从而将四边形
的面积转化成了小正方形
的面积.
__________;
__________.
类比探究
(2)①如图⒉,在矩形
中,
,
,O是边
的中点,
,点E在
上,点F在
上,则
__________.
②如图3,将问题中的正方形
改为菱形
,且
,当
时,其他条件不变,四边形
的面积还是一个定值吗?若是,请求出四边形
的面积;若不是,请说明理由.
拓展延伸
(3)如图4,在四边形
中,
,
,
,
,
是
的平分线,求四边形
的面积.
在综合与实践课上,某数学研究小组提出了这样一个问题:如图1,在边长为4的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e689223dbda856ab0898b0010ffb86a.png)
爱思考的浩浩和小航分别探究出了如下两种解题思路.
浩浩:如图a,充分利用正方形对角线垂直、相等且互相平分等性质,证明了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e9b8559813d320d0439aeb6a7fb32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29469ffc253990fb7036224c0807eabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11cf9c64341fe7583043e5e721a9f4c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e689223dbda856ab0898b0010ffb86a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
小航:如图b,考虑到正方形对角线的特征,过点O分别作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdaf6769ca790186718cc60c7b89ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27acaeba896dd1a4a221151ffa464848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f651cafe4e7eabefc7d9db3364a46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e689223dbda856ab0898b0010ffb86a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/576f3737faa25501719f13e7495d7ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8678190eb56dda0061c60fe08bc2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a12ffa9b9913fb53f8f50a420df7373.png)
类比探究
(2)①如图⒉,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319ff9f648fedec284a11a9761cb6183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f273e22d58841c1a850d4b96cebbcaf9.png)
②如图3,将问题中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e901c430af74f7bbce43364bd4f2e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee480d748f36c1b43e941384dd41f13e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e689223dbda856ab0898b0010ffb86a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e689223dbda856ab0898b0010ffb86a.png)
拓展延伸
(3)如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8b709a173120436dac669c74b927d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
【推荐1】如图, 在矩形
中,
, 点
是射线
上一动点且以 每秒3个单位的速度从
出发向右运动, 连结
交
于点
, 作
于
交直 线
于
, 设
点运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928130994659328/2947313120591872/STEM/53d007ec-016e-4ee4-adac-361f0e578f85.png?resizew=188)
(1)若将线段
绕点
旋转后恰好落在直线
上, 则
__________.
(2)当点
在线段
上运动时, 若
, 求
的值.
(3)连结
, 点
在运动过程中, 是否存在
的值, 使
为等腰三角形? 若存在, 请求出
的值; 若不存在, 请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8225c27ce7a8db2abc95072301be808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a09a73cb9cc0efcd9cd0ca3288dc60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928130994659328/2947313120591872/STEM/53d007ec-016e-4ee4-adac-361f0e578f85.png?resizew=188)
(1)若将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d385f60d35804535c78ae45fe4e4501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c084dc62a6c09bcccc424c48e1b0e0a.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cac0874112593db12788e214397d813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0234cd0cb930b3179609d289c90e22cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7e62cf151f67a1b0747f3b410a27a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
|
困难
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名校
【推荐2】如图,在△ABC中,
,△ABC的两条角平分线BF、CE相交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/1191a4a6-f8af-496b-ad39-3c706e461f62.png?resizew=156)
(1)
度.
(2)如图,平行四边形ABCD中,对角线
,在AD上截取AH=AB,连接BH交AC于点F,过点C作CE平分
交BH于点G.若
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/56ce440a-ec20-42d7-be48-1c0e3dc88508.png?resizew=212)
①求
的值.
②求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25daa6a88cd90fe8e5c532f21511ed91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/1191a4a6-f8af-496b-ad39-3c706e461f62.png?resizew=156)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cd3c7ab70588e0e593db914ccc67d6.png)
(2)如图,平行四边形ABCD中,对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b968ee7efdb7727c62457a8b58b14ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c484f79c69b61882f2b56f14514400f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/56ce440a-ec20-42d7-be48-1c0e3dc88508.png?resizew=212)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7610b825747815dad099e6f2f842bd29.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1aa12d8ed1e57c406136102e37d767.png)
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解答题-证明题
|
困难
(0.15)
【推荐1】数学课上,王老师出示了这样一个问题:如图1,在矩形
中,
,
是
延长线上一点,且
,连接
,交
于点
,以
为一边在
的左下方作正方形
,连接
.试判断线段
与
的位置关系.
探究展示:小明发现,
垂直平分
,并展示了如下的证明方法:
证明:∵
,∴
.
∵
,∴
.
∵四边形
是矩形,∴
,
∴
.(依据1)
∵
,∴
,∴
.
即
是
的
边上的中线,
又∵
,∴
,.(依据2)
∴
垂直平分
.
![](https://img.xkw.com/dksih/QBM/2022/3/26/2949349907415040/2953825757257728/STEM/47ca1d93-aef0-44aa-9ecf-0daaba691643.png?resizew=512)
(1)反思交流:
①上述证明过程中的“依据1”“依据2”分别是指什么?
②试判断图1中的点
是否在线段
的垂直平分线上,请直接回答,不必证明;
(2)小颖受到小明的启发,继续进行探究,如图2,连接
,以
为一边在
的左下方作正方形
,发现点
在线段
的垂直平分线上,请你给出证明:
(3)拓展应用:如图3,连接
,以
为一边在
的右上方作正方形
,分别以点
,
为圆心,
为半径作弧,两弧交于点
,连接
.若
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
探究展示:小明发现,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019a351c8982e78e7c69503880e2f7a2.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
∵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/87ab15a49cf5f1ad988030e2bfb1f628.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479b9cd3d4a1c6707a7dc608734d4f44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4796a77ffd026046b8eefd50938830a2.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc91d24995f16acfb67b775805c9821a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2022/3/26/2949349907415040/2953825757257728/STEM/47ca1d93-aef0-44aa-9ecf-0daaba691643.png?resizew=512)
(1)反思交流:
①上述证明过程中的“依据1”“依据2”分别是指什么?
②试判断图1中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
(2)小颖受到小明的启发,继续进行探究,如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)拓展应用:如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4293e691e7159acd1c514e67608d548a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】已知:如图四边形ABCD是正方形,∠EAF=45°.
(1)如图1,若点E,F分别在边BC、CD上,延长线段CB至G,使得BG=DF,若BE=4,BG=3,求EF的长;
(2)如图2,若点E,F分别在边CB、DC延长线上时,求证:EF=DF﹣BE;
(3)如图3,如果四边形ABCD不是正方形,但满足AB=AD,∠BAD=∠BCD=90°,∠EAF=45°,且BC=8,DC=12,CF=6,请你直接写出BE的长.
(1)如图1,若点E,F分别在边BC、CD上,延长线段CB至G,使得BG=DF,若BE=4,BG=3,求EF的长;
(2)如图2,若点E,F分别在边CB、DC延长线上时,求证:EF=DF﹣BE;
(3)如图3,如果四边形ABCD不是正方形,但满足AB=AD,∠BAD=∠BCD=90°,∠EAF=45°,且BC=8,DC=12,CF=6,请你直接写出BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/1cdc1060-90f2-42f8-b62c-e0bdca2290f1.png?resizew=566)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
解题方法
【推荐1】
为圆
的弦,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/9bf1d0f0-8a77-4c46-b87d-8fa036b2130d.png?resizew=399)
(1)如图1,求证:
;
(2)如图2,连接
并延长交圆
于点
,连接
,作
于点
,延长
交
于点
,求证:
;
(3)如图3,在(2)的条件下,连接
,延长
交圆
于点
,连接
并延长,与
的延长线交于点
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/9bf1d0f0-8a77-4c46-b87d-8fa036b2130d.png?resizew=399)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5142949086fdc50bacd01b9ab9202320.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8944bb1af77920b5018eebf3af16b2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13aad1de92bc27ce203cbda8ad6672e6.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aaab2487cdd71739e70699461cd464b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】如图1,抛物线y1=
x2
tx-t+2与x轴交于点A,B(点A在点B的左侧),过y轴上的点C(0,4),直线y2=kx+3交x轴,y轴于点M、N,且ON=OC.
(1)求出t与k的值.
(2)抛物线的对称轴交x轴于点D,在x轴上方的对称轴上找一点E,使△BDE与△AOC相似,求出DE的长.
(3)如图2,过抛物线上动点G作GH⊥x轴于点H,交直线y2=kx+3于点Q,若点Q′是点Q关于直线MG的对称点,是否存在点G(不与点C重合),使点Q′落在y轴上?,若存在,请直接写出点G的横坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354c3a283b2b21cc8ac33995aac20a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354c3a283b2b21cc8ac33995aac20a5c.png)
(1)求出t与k的值.
(2)抛物线的对称轴交x轴于点D,在x轴上方的对称轴上找一点E,使△BDE与△AOC相似,求出DE的长.
(3)如图2,过抛物线上动点G作GH⊥x轴于点H,交直线y2=kx+3于点Q,若点Q′是点Q关于直线MG的对称点,是否存在点G(不与点C重合),使点Q′落在y轴上?,若存在,请直接写出点G的横坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179408334340096/2183858288689152/STEM/e6d066e5039c42dd9b66b90ae9d52d97.png?resizew=214)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179408334340096/2183858288689152/STEM/a66ea654cb3b4a7b8eac159b2f8b8349.png?resizew=230)
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