已知等比数列
中,
,则其前
项之和为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef4c617d182432f9bc737ec12ebbf42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
更新时间:2017-02-08 11:56:02
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【推荐1】已知正项等比数列
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【推荐1】英国著名物理学家牛顿用“作切线”的方法求函数零点时,给出的“牛顿数列”在航空航天中应用广泛,若数列
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______ ;数列
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解题方法
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