【问题发现】
(1)如图1,在
中,
,若将
绕点O逆时针旋转
得
,连接
,则
________.
【问题探究】
(2)如图2,已知
是边长为
的等边三角形,以
为边向外作等边
,P为
内一点,连接
,将
绕点C逆时针旋转
,得
,求
的最小值;
【实际应用】
(3)如图3,在长方形
中,边
,P是
边上一动点,Q为
内的任意一点,是否存在一点P和一点Q,使得
有最小值?若存在,请求出此时
的长,若不存在,请说明理由.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba1df94176a1f769c7a0a12bf357fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa8e0c8db19a6c367fb850c71f329c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aab04d7b9e668cbf9bd2b3ffcdaca42.png)
【问题探究】
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ccd6a92be245deed2d784f594a065b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b901937ed0802f380b79b5f0040ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
【实际应用】
(3)如图3,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7cdcffe947cdf84f8c7d1939b36055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abe9d3e8a90b93326efbb14a13cdc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
2024·四川达州·模拟预测 查看更多[3]
2024年四川省达州市九年级中考数学模拟预测题一四川省达州市2023年中考数学模拟预测题(二)(已下线)抢分秘籍11 几何图形中求线段,线段和,面积等最值问题(4题型)-备战2024年中考数学抢分秘籍(全国通用)
更新时间:2024-03-23 14:12:44
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】问题探究
【操作发现】
如图①,在等边
中,点B,C在直线
上,E为
边上的一点,连接
,并把线段
绕点E顺时针旋转
得到线段
,连接
,则线段
与
的数量关系是 ,线段
与直线
所夹锐角的度数是 ;
【类比探究】
如图②,在正方形
中,点B,C在直线
上,E为直线
上的任意一点,连接
,并把线段
绕点E顺时针旋转
得到线段
,连接
,试探究线段
与
的数量关系及线段
与直线
所夹锐角的度数,并说明理由.
【操作发现】
如图①,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【类比探究】
如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/f42f1a95-484d-4f75-9bc8-f410a12c1881.jpg?resizew=375)
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解题方法
【推荐2】(1)已知等边△ABC内接于⊙O.点P为
上的一个动点,连结PA、PB、PC.
①如图1,当线段PC经过点O时,试写出线段PA,PB,PC之间满足的等量关系,并说明理由;
②如图2,点P为
上的任意一点(点P不与点A、点B重合),试探究线段PA,PB,PC之间满足的等量关系,并证明你的结论;
(2)如图3,在△ABC中,AB=4,AC=7,∠BAC的外角平分线交△ABC的外接圆于点P,PE⊥AC于E,求AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
①如图1,当线段PC经过点O时,试写出线段PA,PB,PC之间满足的等量关系,并说明理由;
②如图2,点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(2)如图3,在△ABC中,AB=4,AC=7,∠BAC的外角平分线交△ABC的外接圆于点P,PE⊥AC于E,求AE的长.
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394414218207232/2394762748854272/STEM/d7f1c8ae0bfa41ee9dcad379091abdc8.png?resizew=423)
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名校
【推荐1】已知,直线
分别与
轴,
轴交于点
,点
,过点
的直线
交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c61fa072-23a1-430c-98f9-25c58764274e.png?resizew=342)
(1)求直线
的解析式;
(2)如图1,点
为直线
上的一个动点,
为线段
的中点,若
的面积与
的面积相等,求点
的坐标;
(3)如图2,
为直线
上一点,经过点
的直线:
交
轴于点
,交
轴于点
,连接
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b5062be5cf27ae8089ad0c25d1b7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114460aab294eb99eec63e94b675216f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c61fa072-23a1-430c-98f9-25c58764274e.png?resizew=342)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2307c9353c5313fa02a2aed5ec58909f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5554a50fecb38fa711e393556a3031.png)
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【推荐2】如图1,E是正方形
外一点,且满足
,连接
.
平分
;
(2)如图2,连接
,求证:
;
(3)如图3,M是
的中点,作
于点N,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2556d8a3c762f55138aa3afceedd72.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/eb3de20ba8bda63c650ef571be155702.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f038e2592f39a62c432898a2b05b9b.png)
(3)如图3,M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a44b404e8e43c7b7617d3fdbeea1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f64f3a1748b432f6a8f13881c3da334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f721340387f17c4331a5f07a97f7025a.png)
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解题方法
【推荐3】如图,在直角坐标系中,点A(0,6),B(8,0),点C是线段AB的中点,CD⊥OB交OB于D,Rt△EFH的斜边EH在射线AB上,顶点F在射线AB的左侧,EF∥OA,点E从点A出发,以每秒1个单位的速度向B运动,到点B停止,AE=EF,运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/80b07dd2-bfbc-42e7-a81f-d2002faaecf3.png?resizew=201)
(1)在Rt△EFH中,EF= ,EH= ,点F坐标为( , )(用含t的代数式表示)
(2)t为何值时,H与C重合?
(3)设△EFH与△CDB重叠部分图形的面积为S(S>0),求S与t的函数关系式.
(4)在整个运动过程中,Rt△EFH扫过的面积是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/80b07dd2-bfbc-42e7-a81f-d2002faaecf3.png?resizew=201)
(1)在Rt△EFH中,EF= ,EH= ,点F坐标为( , )(用含t的代数式表示)
(2)t为何值时,H与C重合?
(3)设△EFH与△CDB重叠部分图形的面积为S(S>0),求S与t的函数关系式.
(4)在整个运动过程中,Rt△EFH扫过的面积是多少?
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【推荐1】如图,在矩形
中,
,
为
边的中点,
为对角线
的中点,以点
为顶点作
,
交
边于点
,
交
边于点
,连接
.
(1)求
的值;
(2)求证:
;
(3)作射线
与射线
交于点
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fd792376c623d8299f554b46486f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.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/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/45594b05-228c-44ed-80d0-cbae2fcab712.png?resizew=215)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4821eec9eb06107b9297db207544d62a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62003f48b6c87d66f119497d12199d3c.png)
(3)作射线
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8c56b8f4636358d8eb13fb510f08e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f7f7cc94d8902f55a5fe8f0a745590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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【推荐2】如图1,半圆O的直径为
,点M为半圆上一动点(不与点A,B重合),点N为弧
的中点,
于点D,过点M的切线交
的延长线于点C,连结
.
(1)若
(如图2所示),
①求证:
;
②填空:四边形
是哪种特殊的四边形?(直接写出结论)__________.
(2)填空:当
______°时,四边形
为菱形.(直接写出结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e969c5d40f94e6100407df1b9567e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a895c63ec5b8f15565df016f5b3f30.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54502d82788269619ce89afac8efa122.png)
②填空:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e80a65a1c6476f3200505173186684.png)
(2)填空:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80999e234b3d5641ef47db2e9eae6a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db76992c76bca97cfb90ff752f5a657.png)
![](https://img.xkw.com/dksih/QBM/2021/5/21/2725747379888128/2725955215343616/STEM/290284d0-0b8c-409c-9d6a-2f27fbea1105.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知抛物线
是常数,
,自变量
与函数值
的部分对应值如下表:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3bac4a2f-07d5-436e-be17-8a70cc570cfa.png?resizew=233)
(1)根据以上信息,可知抛物线开口向______,对称轴为直线______.
(2)求抛物线的解析式和
的值.
(3)将抛物线
的图象记为
,将
绕点
旋转
后的图象记为
合起来得到的图象记为
,完成以下问题:
①若直线
与函数
有且只有两个交点,直接写出
的取值范围.
②若对于函数
上的两点
,当
时,总有
,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04702f417fc63d6c899bd9b1c1a3fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28b08682efa2692b052f64fe1448fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
0 | 1 | 2 | 3 | … | |
1 | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3bac4a2f-07d5-436e-be17-8a70cc570cfa.png?resizew=233)
(1)根据以上信息,可知抛物线开口向______,对称轴为直线______.
(2)求抛物线的解析式和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31481f1d288bc96c83434c863a1d9140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee12926fd31aa5a5f86a97c259e4b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead6a3dbd03539ef5e0807be57bb1e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
②若对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6f381a23847d87c5a9d414f3ad3e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdfe3ba6d55132bb468fcab9c2b74a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-证明题
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较难
(0.4)
【推荐2】如图:AD与⊙O相切于点D,AF经过圆心与圆交于点E、F,连接DE、DF,且EF=6,AD=4.
(1)证明:AD2=AE•AF;
(2)延长AD到点B,使DB=AD,直径EF上有一动点C,连接CB交DF于点G,连接EG,设∠ACB=α,BG=x,EG=y.
①当
时,探索EG与BD的大小关系?并说明理由;
②当
时,求y与x的关系式,并用x的代数式表示y.
(1)证明:AD2=AE•AF;
(2)延长AD到点B,使DB=AD,直径EF上有一动点C,连接CB交DF于点G,连接EG,设∠ACB=α,BG=x,EG=y.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff881b2f51d2bd69229797fec274852.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/d8127050-e447-4a24-9d55-52af13c688aa.png?resizew=315)
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解答题-作图题
|
较难
(0.4)
【推荐3】综合与实践
问题情境:活动课上,同学们以三角形为背景探究图形变化中的数学问题.如图1,
中,
.将
从图1的位置开始绕点C顺时针旋转得到
(点A,B的对应点分别为点
),旋转角为α(
).
操作思考:
(1)如图2,“明辨”小组画出了
恰好经过点B时的图形.求此时旋转角α的度数;
(2)如图3,“善思”小组画出了点
落在
延长线上时的图形,此时点
也恰好在
的延长线上.过点B作
的平行线交
于点P,猜想
和
的数量关系,并说明理由;
拓展探究:
(3)如图4,“博学”小组在图2的基础上,将
沿射线
的方向平移,点B,C,
的对应点分别为D,E,F,若
,当以A,
,D为顶点的三角形是以
为底边的等腰三角形时,请直接写出平移的距离.
问题情境:活动课上,同学们以三角形为背景探究图形变化中的数学问题.如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1320d3b30daf11c5a7419983da3b3776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
操作思考:
(1)如图2,“明辨”小组画出了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
(2)如图3,“善思”小组画出了点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
拓展探究:
(3)如图4,“博学”小组在图2的基础上,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def0507ec4fec5f53b5e55d74ba3a3e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5326817f9af012432a202749d1df59f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/3f3aa813-d288-4500-aeec-90403e85eef1.png?resizew=561)
您最近一年使用:0次