如图,四边形
中,
,
,且
、
的周长相等,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/84e64b74-01aa-4592-91f6-39e14bae0268.png?resizew=111)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e084230be8f8467d5c68c88b568855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26015ca6b598fa7da77ecda00ce0d1d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/84e64b74-01aa-4592-91f6-39e14bae0268.png?resizew=111)
A.![]() | B.![]() | C.![]() | D.![]() |
20-21高三下·安徽·阶段练习 查看更多[2]
更新时间:2021-05-01 06:41:08
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【推荐1】已知
,
都为锐角,
,
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6b1670b2b446ace5bc12d7385b8e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7c90e64d595a079c22c97b8340cd559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
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【推荐2】设直线
与函数
、
、
的图象在
内交点的横坐标依次是
、
、
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc3d6c93c32fe56460502930dbf188b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c65d71e57e6e7697e2f627dcd58583.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f00f2f6ab162f9333ec55db195d663b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
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【推荐3】八角星纹是大汶口文化中期彩陶纹样中具有鲜明特色的花纹.八角星纹常绘于彩陶盆和豆的上腹,先于器外的上腹施一圈红色底衬,然后在上面绘并列的八角星形的单独纹样.八角星纹以白彩绘成,黑线勾边,中为方形或圆形,具有向四面八方扩张的感觉.八角星纹延续的时间较长,传播范围亦广,在长江以南的时间稍晚的崧泽文化的陶豆座上也屡见刻有八角大汶口文化八角星纹星纹.图2是图1抽象出来的图形,在图2中,圆中各个三角形为等腰直角三角形,中间阴影部分是正方形且边长为2,其中动点P在圆
上,定点A、B所在位置如图所示,则
最大值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/8574fd5b-5501-4536-8f9e-fe0a0d7f466e.png?resizew=526)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐1】已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4f3f00d1cce6027f65e3cb8a895512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e46d0336ea9893b942b928a9ee57a1c.png)
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【推荐2】下列说法正确的是( )
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【推荐1】中国数学家华罗庚倡导的“
优选法”在各领域都应用广泛,
就是黄金分割比
的近似值,古希腊的数学家毕达哥拉斯通过研究正五边形和正十边形的作图,发现了黄金分割率,黄金分割率的值也可以用
表示,即
,则
的值为( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8382dcdb655ab1d049f8dba22fa467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3caf448beca2df4d2427360e93b599.png)
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【推荐2】在
中,内角
,
,
所对的边分别为
,
,
,
的平分线交
于点
,若
且
,则
与
一定满足的关系为( )
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【推荐1】某小区打算将如图所示的
区域进行改建,在三边上各选一点连成等边三角形
,在其内部建造文化景观,已知
,
,则
区域面积(单位:
)的最小值为( )
![](https://img.xkw.com/dksih/QBM/2020/2/21/2403904806682624/2404047622914048/STEM/e13705d48ccb4edca8d02bf9f0e216bd.png?resizew=190)
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【推荐2】如图是某人设计的产品图纸,已知四边形ABCD的三个顶点A,B,C在某圆上,且
,
,
,
,
,则该圆的面积为( ).
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