已知等差数列
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ceb07579a324c33d004518ada30b8d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0d4c35d9b8f32883a0ba64ac61dfcf.png)
A.25 | B.15 | C.10 | D.20 |
更新时间:2020-06-16 10:37:09
|
【知识点】 利用等差数列的性质计算
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【推荐1】已知等差数列
中,
,则该数列前9项和
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218fc022977dbf9c5b5c3c6b6dcf201e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
A.4 | B.8 | C.36 | D.72 |
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【推荐2】已知数阵中,每行的三个数依次成等差数列,每列的三个数也依次成等差数列;若
,则该数阵
中九个数的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95eb29028d2bfccfb2d886a180b6fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ac40ade1fac57351ff631aa530398e.png)
A.18 | B.27 | C.45 | D.54 |
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