配套习题- 等差数列前n项和公式的变形 -【青果学院】

1/4单选题

难度：

1.若一个数列的前n项和公式是

，这个数列是等差数列吗？

A	不是
B	是

正确答案：QQ==

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

2/4单选题

难度：

2.若一个数列的前n项和是

数列是等差数列吗？

A	是
B	不是

正确答案：QQ==

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

3/4单选题

难度：

3.已知等差数列的前n项和的公式是

,则此等差数列的通项公式是（）

A
B
C
D

正确答案：QQ==

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

4/4单选题

难度：

4.已知等差数列的前n项和公式是

，则此等差数列的通项公式是（）

A
B
C	通项公式不存在
D

正确答案：RA==

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