Gaokao Math Practice Question
7. (5 分) 设等差数列 $\left\{a_{n}\right\}$ 的前 $n$ 项和为 $S_{n}$, 若 $S_{m-1}=-2, S_{m}=0, S_{m+1}=3$, 则 $m=$
- A.3
- B.4
- C.5
- D.6
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