1 . 若四位数
的四个数码满足
,则称其为“好数”(如2011就是一个好数).那么,好数的个数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35893041a02be39c9d0c1e9b329556eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eeda5cef4846ef829069fe27f64e34e.png)
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2011高三·山西·竞赛
2 . 函数
的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f69bca0b66a540d094674c995d290c5c.png)
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2011高三·山西·竞赛
3 . 如图,在单位正方体
中,
、
、
分别是棱
、
、
的中点.则点
到
所在平面的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ce22f30a8de2af135de3c89403aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9756177ef0c7c685e0fc62077a1cd4e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/3992d890-7618-4ecf-90f6-a89ebcc4cb3f.png?resizew=142)
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2011高三·山西·竞赛
4 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca77726b5ab51fbcab8d0d2cda6ac826.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca77726b5ab51fbcab8d0d2cda6ac826.png)
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5 . 若
、
都是完全平方数,则正整数
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41505e5e2ee8177abc71e367a0f9d53e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3c0c82e1c3e2987b5251c0666fe68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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6 . 数列
满足
,
,
.则其前100项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f586e220bf51df3e75588401bd218f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381576e698a46df8c497e6b5f8346ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe42740790d7a683cc13cb02b90d35d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9957106aea5bcdc42b215992fa3ddee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f586e220bf51df3e75588401bd218f.png)
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7 . 椭圆
的焦点为
、
.若椭圆上的一点
使
,则
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf7791a0a3af57c1c809a6dc9726936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2427943a38dcd93c9ec9b735ffc9fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9df1061c3ba5151ba2f7359acaf356.png)
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2011高三·山西·竞赛
8 . 在集合
中,末位数字为1的元素个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8afb9133a2f44900c631435f4965e2b.png)
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2010高三·山西·竞赛
9 . 若四位数
的四个数位中至多含有两个不同的数码,则称
为“简单四位数”(如5555和3313 ).那么,简单四位数的个数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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