名校
解题方法
1 . 如图,边长为2的正方形中有一阴影区域.在正方形中随机撒一粒豆子,它落在阴影区域内的概率是
,则明影区域的面积为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/204b432e-75f4-4ef8-9e64-99e56aa0ece0.png?resizew=128)
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2 . 已知
是
的重心,现将一粒黄豆随机撒在
内,则黄豆落在
内的概率是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8c7c8c8702adfbd6bcacc94a6bc661.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 如图,在边长为
(
为自然对数的底数)的正方形中随机撒一粒黄豆,则他落到阴影部分的概率为______ .(图中曲线为
和
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eae1b87c23b45ce5e5e74d5b1d73234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572001155366912/1572001161109504/STEM/388fb370-bc89-4acb-842c-0272ba4fb6fc.png?resizew=180)
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解题方法
4 . 如图,圆周上的6个点是该圆周的6个等分点,分别连接
,
,
,
,
,
,向圆内部随机投掷一点,则该点不落在阴影部分内的概率是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/833fdaf6-3678-4cb3-a54f-1fd6e71369df.png?resizew=114)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/833fdaf6-3678-4cb3-a54f-1fd6e71369df.png?resizew=114)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 如图所示,在边长为1的正方形
中任取一点
,则点
恰好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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572701994221568/1572702000349184/STEM/d6d7aa52d0d44d9b9c65b9ad4cc1fb1e.png?resizew=160)
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6 . 向图中边长为2的正方形中,随机撒一粒黄豆,则黄豆落在图中阴影部分的概率为
![](https://img.xkw.com/dksih/QBM/2015/3/25/1572029303799808/1572029309419520/STEM/986a8cb00bc842bc96681784ffbd0c4c.png?resizew=142)
![](https://img.xkw.com/dksih/QBM/2015/3/25/1572029303799808/1572029309419520/STEM/986a8cb00bc842bc96681784ffbd0c4c.png?resizew=142)
A.![]() | B.![]() |
C.![]() | D.![]() |
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