名校
1 . 设各项均为正数的等比数列
的前n项和为
,
,
,则
=________ .
![](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/707009f53e24148b3a7949d98035f870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157fc73999f07d08e7814c83f8aa4783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
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2019-09-29更新
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1047次组卷
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2卷引用:2019年河南省南阳市第一中学高三上学期第二次开学考试数学(文)试题