解题方法
1 . 已知等差数列
的前n项和为
,等比数列
的前n项和为
,则下列说法正确的是( )
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
A.若![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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A.若![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.若![]() ![]() ![]() |