已知从2开始的连续偶数构成以下数表,如图所示,在该数表中位于第m行、第n列的数记为
,如
,
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f85450a0f1417ad2acd30e568679fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eba1bc1bfc3def75c03f2c473330af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a52fea6bb4b7b526de7f3ff95eb4bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bc720c739782edea860e7194177cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847496620875776/2847544147681280/STEM/5dde301157f7498192847627ddafaa5b.png?resizew=174)
更新时间:2021-11-09 13:26:18
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【推荐1】已知各项均不为
的等差数列
,满足
,数列
为等比数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8bb98098c7890ec6d79fa71e08919c.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐2】在等差数列
中,
为它的前
项和,若
,
,
,则当
最大时,
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb15e818ed3399e6acfb390f4805b743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f0853863ab2c68e6393b1049aa7fe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解题方法
【推荐1】已知数列
的前n项和为
,
,且
,记
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1d0eecf01e40db77f52401a91ed9f1.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cefeddf71dca8ae824328df3f0e5e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea363f2734ab5cf0746553e9fac248d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a348f64b0925005de44cc6b8a82422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1d0eecf01e40db77f52401a91ed9f1.png)
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【推荐2】已知数列
是各项均不为零的等差数列,
为其前
项和,且
,若不等式
对任意
恒成立,则实数
的最小值是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11a8123407e15b49abc03b47f91d5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb2c5f869a2c7b1a74cf8bcd0c74819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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