2020·北京·模拟预测
解题方法
1 . 麒麟是中国传统瑞兽.古人认为,麒麟出没处,必有祥瑞.有时用来比喻才能杰出、德才兼备的人.下图是客家麒麟图腾,为了测量图案中黑色部分面积,用随机模拟的方法来估计.现将图案剪成长5cm,宽4cm的矩形,然后在图案中随机产生了500个点,恰有248个点落在黑色区域内,则黑色区域的面积的估计值为__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
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2 . 已知正方形
,向正方形
内任投一点
,则
的面积大于正方形
面积四分之一的概率是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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3 . 设正方形
的边长是
,在该正方形区域内随机取一个点,则此点到点
的距离大于
的概率是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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2019-07-11更新
|
396次组卷
|
4卷引用:北京市西城区2018 -2019学年高一第二学期期末数学试题
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4 . 已知正方形
.
(
)在
,
,
,
四点中任取两点连线,则余下的两点在此直线异侧的概率是__________ .
(
)向正方形
内任投一点
,则
的面积大于正方形
面积四分之一的概率是__________ .
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(
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(
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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5 . 如图,边长为
的正方形中有一封闭曲线围成的阴影区域,在正方形中随机撒
粒豆子,
粒中有
粒落在阴影区域,则阴影区域的面积约为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123635822592/1977723837718528/STEM/bf49aca65e024ba2b0efcf05c58f79b0.png?resizew=128)
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2018-06-29更新
|
358次组卷
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2卷引用:北京十二中2016-2017学年下学期高二期中试卷 数学(文科)
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6 . 中国古代钱币(如图
)承继了礼器玉琮的观念,它全方位承载和涵盖了中华文明历史进程中的文化信息,表现为圆形方孔.如图
,圆形钱币的半径为
,正方形边长为
,在圆形内随机取一点,则此点取自黑色部分的概率是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9862c3f79df375b515dc9f707c763444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4fe52baabb3071d55134f157a6079.png)
![](https://img.xkw.com/dksih/QBM/2018/1/24/1867111030120448/1872137148956672/STEM/49f91a04be4d42dabfc1446da552769a.png?resizew=279)
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解题方法
7 . 如图所示,边长为
的正方形中有一封闭曲线围成的阴影区域,在正方形中随机撒一粒豆子,若它落在阴影区域内的概率为
,则阴影区域的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1975123104964608/null/STEM/cc75986780494019ba18954ee48cff5b.png?resizew=108)
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2018-06-29更新
|
342次组卷
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4卷引用:【全国百强校】北京师范大学附属中学2016-2017学年高一下学期期末考试数学试题
8 . 设
为不等式组
所表示的平面区域,
为不等式组
所表示的平面区域,其中
,在
内随机取一点
,记点
在
内的概率为
.
(
)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e989c65b1aaa8812e0e8bb6983c2bd0.png)
__________ .
(
)
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63a99057532d3499597402aed424d63.png)
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2018-07-02更新
|
855次组卷
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4卷引用:2014届北京市丰台区高三一模文科数学试卷
10-11高二下·北京·期中
解题方法
9 . 从如图所示的正方形
区域内任取一个点
,则点
取自阴影部分的概率为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ff7e0ef1f622120cc1b18e9d3e80ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/f6201ae5-2ea5-44fe-b265-e9fd7367ae10.png?resizew=218)
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10 . 设不等式组
表示的平面区域为
.在区域
内随机取一个点,则此点到直线
的距离大于
的概率是___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f34866ec191a9cb638c5bae9de183f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca8e3b654909a9d5e1cf044fc3ee49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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2017-02-08更新
|
363次组卷
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4卷引用:2017-2018年北京市首都师大附中高二期末理试题
2017-2018年北京市首都师大附中高二期末理试题2017届四川双流中学高三文必得分训练8数学试卷河南省息县第一高级中学2017届高三第七次适应性考试数学(文)试题(已下线)二轮复习【文】专题16 概率与统计 押题专练