1 . 如图,已知钝角
,依下列步骤尺规作图,并保留作图痕迹.
步骤1:以
为圆心,以
为半径画弧①;
步骤2:以
为圆心,以
为半径画弧②,交弧①于点
;
步骤3:连接
,再连接
,与
的延长线交于点
.
下列叙述正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/e1e792ac-50ed-4f26-8e10-3364c6767ad2.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
步骤1:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
步骤2:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
步骤3:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb9b29668bafeccf32ca33022e96d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
下列叙述正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/e1e792ac-50ed-4f26-8e10-3364c6767ad2.png?resizew=145)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() |
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2 . 如图所示的衣架可以近似看成一个等腰三角形
,其中
,
,
cm,则高
约为( )
(参考数据:,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc5db7ac344c05465dbabcc5e3d696.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/32523c5b-66bf-415a-8e09-334af3311b38.png?resizew=223)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1816fb0bed72025e79aa4b7185055ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a5dae3b3a443748604b79401616239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c6cf2f16410d7602d14c320bb80bc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(参考数据:,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae2f44d211b6cef769061ef0e7bf45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fc5db7ac344c05465dbabcc5e3d696.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/32523c5b-66bf-415a-8e09-334af3311b38.png?resizew=223)
A.22.44cm | B.9.90cm | C.11.22cm | D.19.58cm |
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3 . 大自然中有许多小动物都是“小数学家”,如图1,蜜蜂的蜂巢结构非常精巧、实用而且节省材料,多名学者通过观测研究发现:蜂巢巢房的横截面大都是正六边形.如图2,一个巢房的横截面为正六边形
,若对角线
的长约为
,则正六边形
的边长为( )
![](https://img.xkw.com/dksih/QBM/2022/10/24/3094746410770432/3094818798682112/STEM/29c47844fd374c908f1478221cc97fc3.png?resizew=301)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b512022066e781729bb8087fc0580d88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/2022/10/24/3094746410770432/3094818798682112/STEM/29c47844fd374c908f1478221cc97fc3.png?resizew=301)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 已知反比例函数
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15c9d3e50dc0fd6aa1a75b3eb73ca71.png)
A.若点![]() ![]() |
B.当![]() |
C.其图象分别位于第一、三象限 |
D.若点![]() ![]() ![]() ![]() |
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5 . 若
可以分解为
,那么
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e7e7520426da31225d16907ee75a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58cfd35454b45556dc4429ac336ceae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4825990d7720b3e88f14deb1e7123ef.png)
A.![]() | B.45 | C.![]() | D.3 |
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6 . 如图,公路
,
互相垂直,公路
的中点
与点
被湖隔开.若测得
的长为
,则
,
两点间的距离为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b0b652f5-cd3a-4860-ba5f-ca16f3def2b8.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5656eaa3a8b00e2b10efe32eb537d5a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/b0b652f5-cd3a-4860-ba5f-ca16f3def2b8.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 国家统计局统计数据显示,我国快递业务收入逐年增加.2017年至2019年我国快递业务收入由
亿元增加到
亿元.设我国2017年至2019年快递业务收入的年平均增长率为
.则可列方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4b31ff8c25710c8c0d3480f5c18d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadee265e39fe8ca866ebf90c4305d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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8 . 如图,反比例函数与正比例函数的图象相交于
、
两点,过点
作
轴于点
.若
的面积是4,则这个反比例函数的解析式为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/9ffd6bc1-896a-4303-98fd-723ef68dc740.png?resizew=172)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2241bd71e0c20867029e489f9ba655d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/9ffd6bc1-896a-4303-98fd-723ef68dc740.png?resizew=172)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 构建几何图形解决代数问题是“数形结合”思想的重要应用,在计算tan15°时,如图.在Rt△ACB中,∠C=90°,∠ABC=30°,延长CB使BD=AB,连接AD,得∠D=15°,所以tan15°![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3848b9086dcdbb4cb69596061cda6edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf540698b5e2fc91de42b87ec6569574.png)
=
.类比这种方法,计算tan22.5°的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/330977dd-f267-41bc-bf42-b7c3935ca72d.png?resizew=260)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3848b9086dcdbb4cb69596061cda6edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf540698b5e2fc91de42b87ec6569574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5833c1bb0376f06bd77254ccbfcc49d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47cfe4e08c06bde245e58aa22485044c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/330977dd-f267-41bc-bf42-b7c3935ca72d.png?resizew=260)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
10 . 如图①,点
从
的顶点
出发,沿
匀速运动到点
,图②是点
运动时,线段
的长度
随时间
变化的关系图象,其中
是曲线部分的最低点,则
的面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/7491ad95-2e71-4ece-8994-2a873e43c1d0.png?resizew=386)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7012d1ff11db5e150182e19646814cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/7491ad95-2e71-4ece-8994-2a873e43c1d0.png?resizew=386)
A.![]() | B.![]() | C.![]() | D.![]() |
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