设等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ec42a1fb4d702c725f469141866bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
更新时间:2023-05-05 11:27:00
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【推荐1】已知
,
.若a,b,c成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47b71b9163c8163332efeecd1c9219b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94818fcbc67a4ba0dbc83274d657dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
您最近一年使用:0次
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【推荐2】在等差数列
中,
,则
的前5项和
=______________ .
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/c64e74c195e3403d9ebb8454a4cbdea7.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/f0e576d4a8824665a7f90163023dcb27.png?resizew=19)
您最近一年使用:0次
填空题-单空题
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(0.94)
【推荐1】已知
为等差数列
的前
项和,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef65e4af82de23d7d2a38b950e163aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
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【推荐2】已知数列
是等差数列,若
,其前10项和
,则数列
的公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170b74434f9726be33895bbd3bfec4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad13b74344ed3d7aacb3e7ebbe635f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
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