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1 . 考古发现,在埃及金字塔内有一组神秘的数字142857,因为
,
,……所以这组数字又叫走马灯数.该组数字还有如下规律:
,
,……若从
这
个数字中任意取出
个数字构成一个三位数
,则
的结果恰好是剩下3个数字构成的一个三位数的概率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c8a408a05173407451ce3b912e8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac9b0020e1202ea79df5cc3faffd47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57abca0a2f0de598b9ead89164a2b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6656b194fff1cc8733a48079f7c7b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1a5bc59667a07cac1897fd1c7ab3c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1fb7b76f2d5aa5abb45850a216c55a.png)
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2021-01-10更新
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294次组卷
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2卷引用:江苏省扬州中学2021-2022学年高二下学期5月月考数学试题