对于给定的正整数
,若等差数列
,
,
,…满足
,则
的最大值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b98e4677a24bc48af008f718eb6b0955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350be7ba614ebdc409f03f1d25b1508a.png)
2016·上海·模拟预测 查看更多[1]
更新时间:2020-02-03 19:35:42
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【推荐1】在公差大于0的等差数列
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,且
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【推荐2】已知
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的前n项和,若
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,则
的最小值为___________ .
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解题方法
【推荐1】设随机变量
的分布列如下:
①
;
②当
时,
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③若
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;
④
的通项公式可能为
.
其由所有正确命题的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![]() | 1 | 2 | 3 | 4 | 5 |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f2bed5ab3f7ee6437e5b319c349a9d.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16a2c550150134d5f269bc3c7d951c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0525f953d1c50af1bc1858a5a7936ec3.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13a3abeb803e07064e5078f1710c4aa.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc1dda068b34ce0a8062dd790f03e29.png)
其由所有正确命题的序号是
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【推荐2】在等差数列
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【推荐1】已知等差数列
前
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的值为________
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【推荐2】已知数列的通项
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_________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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【推荐1】欧拉函数
的函数值等于所有不超过正整数n,且与n互质的正整数的个数,例如:
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,
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,使得
成立,则实数
的最大值为__________ .
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