如图,已知正
边长为2,E ,F,G为三边上的点,
,则当
=____ 时,
的面积有最小值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e721d719f1e6d7413a2d2bfa25d346b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/9d2521d0-5e96-42e8-8d0c-5a3e682e9ac3.png?resizew=160)
更新时间:2022-11-03 14:53:03
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【推荐1】已知二次函数
的图象与x轴只有一个公共点.
(1)求m=_________ .
(2)当0≤x≤3时,y的取值范围为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b14bc84dde0a4d755e16e33f6200e31.png)
(1)求m=
(2)当0≤x≤3时,y的取值范围为
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【推荐2】二次函数
的图象如图所示,对称轴是直线
,给出下列结论:
①
;
②方程
必有一个根大于2且小于3;
③若
,
是抛物线上的两点,那么
;
④
;
⑤对于任意实数m,都有
,
其中正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
②方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ff52ec8dab4aaac7b28a0efe580d86.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb6e4806d5ec3bb39c30147c296935b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb22ebad52d3607c2132ad0cb57bde8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e450b7708a5777cf012edbdb457b7eb.png)
⑤对于任意实数m,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/125bf47ec3bb292182877ec086be17fe.png)
其中正确结论的序号是
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【推荐1】如图,在直角三角形ABC中,
,
,E、F分别为边AC、AB的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8b04cc34edfeccb61a92bd2c5d0292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/a7d8a239-965f-464e-868f-35564b8dee3e.png?resizew=123)
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【推荐2】如图,在长方形
中,将
沿对角线
对折,得到
,
与
交于点F,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321590996dbc3869d9c18c4c53fe3f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f9872c353d7721b8fe90719dc6d72d.png)
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【推荐1】同一个圆的中内接正三角形与其外切正三角形的周长比是________ ,面积比是________ .
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【推荐2】如图三条直线
互相平行,且
与
的距离为2,
与
的距离为4,等边
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的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285e69b158ce4a51538939451538efdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/2d749987-6f3e-484e-b209-271b4a09970c.png?resizew=222)
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