等差数列{a n }的前n项和为S n ,且S 3 =6,a 1 =4,则公差d等于 [ ] A.1B. C.-2D. 3

等差数列{a n }的前n项和为S n ,且S 3 =6,a 1 =4,则公差d等于 [ ] A.1B. C.-2D. 3
2025-05-14 09:55:30
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回答1:

C