在
中,
,
是锐角,若
,且
,则
面积的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3b37c1b382628dc3ab9f0a97c80b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e8f6faf46c448fe8d838fde1af495b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6a9b103299a6ccb134bb8044038e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-04-07 15:31:14
|
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图,在等边
的边上分别取点D,E,F,使
,连接
,
,
.
结论Ⅰ:当
时,
的面积取得最小值;
结论Ⅱ:若点O是
的外心,则它一定也是
的外心.对于结论Ⅰ和Ⅱ,下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcb4e1c3913b81c0096f1a14096d677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
结论Ⅰ:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
结论Ⅱ:若点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
A.Ⅰ和Ⅱ都对 | B.Ⅰ和Ⅱ都不对 |
C.Ⅰ不对Ⅱ对 | D.Ⅰ对Ⅱ不对 |
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【推荐2】如图所示,在一个直角三角形的内部作一个长方形ABCD,其中AB和BC分别在两直角边上,设AB=xm,长方形的面积为ym2,要使长方形的面积最大,其边长x应为( )
![](https://img.xkw.com/dksih/QBM/2016/3/7/1573981544333312/1573981550223360/STEM/aab0bbaab2074bdc9528de41626b294f.png)
![](https://img.xkw.com/dksih/QBM/2016/3/7/1573981544333312/1573981550223360/STEM/aab0bbaab2074bdc9528de41626b294f.png)
A.![]() | B.6m | C.25m | D.![]() |
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【推荐1】将矩形纸片
按如图所示的方式折叠,恰好得到菱形
.若
,则菱形
的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/a26c6004-c443-427b-8229-c46e04cc525a.png?resizew=250)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/a26c6004-c443-427b-8229-c46e04cc525a.png?resizew=250)
A.![]() | B.![]() | C.4 | D.8 |
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真题
【推荐2】如图,在等腰直角
,
是斜边
的中点,点
分别在直角边
上,且
,
交
于点
.则下列结论:
(1)图形中全等的三角形只有两对;(2)
的面积等于四边形
的面积的
倍;(3)
;(4)
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/84ed0944-7ef5-4d15-8954-3e4663fc4c68.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacde0d62324c5145f2cd9b63bf7d0be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018fb1bfa58c028322889b7806f5a989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5817a44033087407b1c18845c17f9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)图形中全等的三角形只有两对;(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddc57968a823d0867bc84afd9e086a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451fd7d7729bec229af12cc5787758ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d2cb24e69cb3e4d21bb864dfabc705.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/84ed0944-7ef5-4d15-8954-3e4663fc4c68.png?resizew=184)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,在扇形
中,
,
,点D在
上,点C在弧
上,且点C,O关于直线
对称,连接
,则图中阴影部分的面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/61717ff4-3bf0-4d03-ad73-f548c56f8ac7.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c5b1431b9e9d51f155c9f2e3730e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd294dff51efba04259fae78f2bff9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/61717ff4-3bf0-4d03-ad73-f548c56f8ac7.png?resizew=154)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图在平面直角坐标系中,抛物线
的图像交
轴于
,
,于
轴交于
,点
为
轴上一动点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4185ceba994675ebb41bb8efa399bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4c67ca7220d30c694313583fd19ff3.png)
A.2 | B.![]() | C.![]() | D.4 |
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