已知{an}是等差数列,且a1=3,a3=1,则a4=( )
A.2 | B.0 | C.﹣1 | D.﹣2 |
更新时间:2019-12-25 09:15:42
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【知识点】 等差数列通项公式的基本量计算
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【推荐1】已知等差数列
中,
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的值是( )
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A.30 | B.15 | C.31 | D.64 |
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【推荐2】已知等差数列
的前n项和为
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( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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A.![]() | B.![]() | C.6061 | D.6065 |
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