如图,
,点
在
平分线上,
,若点
,
分别在射线
,
上,
是等边三角形,设
的面积为
,则
的最大值和最小值分别是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/05ae2197-b2ff-4421-b4fb-c013ad413754.png?resizew=178)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07445aa3909818a3ef93bb01182f545f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/05ae2197-b2ff-4421-b4fb-c013ad413754.png?resizew=178)
A.2;1 | B.2;![]() | C.![]() ![]() | D.![]() ![]() |
19-20九年级·浙江杭州·期中 查看更多[1]
(已下线)【新东方】初中数学1161
更新时间:2021-03-17 18:20:54
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相似题推荐
单选题
|
较难
(0.4)
【推荐1】如图,点A是x轴上一个定点,点B从原点O出发沿y轴的正方向移动,以线段
为边在y轴右侧作等边三角形,以线段
为边在
上方作等边三角形,连接
,随点B的移动,下列说法错误的是( )
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894438278963200/2953606519676928/STEM/0014c3c2-ef8d-4d9e-9b27-0fed88892766.png?resizew=202)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894438278963200/2953606519676928/STEM/0014c3c2-ef8d-4d9e-9b27-0fed88892766.png?resizew=202)
A.![]() | B.![]() |
C.直线![]() ![]() | D.随点B的移动,线段![]() |
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【推荐2】如图,在四边形ABCD中,∠A=60,∠B=∠D=90,AB=AD,点E、F分别是AB,AD边上的中点,则sin∠ECF=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/e4b0187c-07cf-43e2-9393-bac164fb476e.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/e4b0187c-07cf-43e2-9393-bac164fb476e.png?resizew=117)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】如图,将矩形
沿
折叠,使点
落在
边上的点
,点
的对应点为点
,连接
、
、
与
交于点
,
与
交于点
,若点
为
中点,
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2020/12/29/2624666681573376/2628963599335424/STEM/f1b5e1b3-075c-4b58-b434-86a4ce38d7f0.png?resizew=197)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.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/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274987b5162f77d02f5cc626f3c42801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2804ee14119541031ce1fdb7c6c7b008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://img.xkw.com/dksih/QBM/2020/12/29/2624666681573376/2628963599335424/STEM/f1b5e1b3-075c-4b58-b434-86a4ce38d7f0.png?resizew=197)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,矩形ABCD长与宽的比为5:3,点E、F分别在边BC、CD上,tan∠1=
,tan∠2=
,则cos(∠1+∠2)的值为( )
![](https://img.xkw.com/dksih/QBM/2019/9/14/2290442617085952/2290688417071104/STEM/256b34cdfa144471a113710f09a8dfd8.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://img.xkw.com/dksih/QBM/2019/9/14/2290442617085952/2290688417071104/STEM/256b34cdfa144471a113710f09a8dfd8.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
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