在
中,
,
,D为边BC上一点,当
最大时,连接AD并延长至点E,使
,则
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
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2023·江苏盐城·一模 查看更多[4]
2023年江苏省盐城市阜宁县中考一模数学试题(已下线)专题08 圆-学易金卷:2023年中考数学一模试题分项汇编(江苏专用)2023年江苏省盐城市大丰区中考一模数学试题2024年江苏省盐城市大丰区九年级数学中考模拟预测题
更新时间:2023-04-15 22:45:54
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【推荐1】如图,正三角形
的边长为a,点E是
边上的动点(不与端点A、B重合),在
上方作正三角形
.当点E由点B向点A运动过程中,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/d339f592-e1f7-4603-82d1-7a727a601b4d.png?resizew=123)
①若
,则
;
②
的度数随着点E的运动而逐渐变小;
③若点G为
的中点,则
的最小值为
;
④
面积的最大值为
.
其中正确的是_____________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/d339f592-e1f7-4603-82d1-7a727a601b4d.png?resizew=123)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
③若点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31907a101de6e470922d21d2d4a7e93.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc53b7f15907cc8c2bec55fff7078e6.png)
其中正确的是
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【推荐2】已知二次函数y=ax2+bx+c中,函数y与自变量x的部分对应值如表:
则当x≥1时,y的最小值是_____ .
x | … | ﹣1 | 0 | 1 | 4 | … |
y | … | 10 | 5 | 2 | 5 | … |
则当x≥1时,y的最小值是
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解题方法
【推荐1】在平面直角坐标xOy中,已知点
,⊙P的半径为1,直线
,给出以下四个结论:①当
时,直线l与⊙P相离;②若直线l是⊙P的一条对称轴,则
;③若直线l是⊙P只有一个公共点A,则
;④若直线l上存在点B,⊙P上存在点N,使得
,则a的最小值为
,其中所有正确的结论序号是___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c79214455c6e55186c959930f334713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2df29bc4b98cfcc6a3237b5fef779e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b24245fe9c8a0c2ce6a962b8b815192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a627db288a044ede594ecc020258d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafef90aa404120a5d784f0e3d47d74a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
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【推荐2】如图,在平面直角坐标系中,点A、B的坐标分别是(0,2)、(4,0),点P是直线y=2x+2上的一动点,当以P为圆心,PO为半径的圆与△AOB的一条边所在直线相切时,点P的坐标为__________ .
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093644635365376/2093771455152129/STEM/17e11e1fe67643e68aea8ae26908904c.png?resizew=141)
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【推荐1】如图,在正方形
中,
,
为
的中点,
为
上一点(不与点
重合),
,
为
上一点,以点
为圆心,
长为半径画弧交
于点
,分别以点
,
为圆心,大于
长为半径画弧,两弧交于点
,射线
交
延长线于点
,连接
,则
的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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【推荐2】在
中,以边
为直径作半圆交边
、
于点
、
,
,
,则
为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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