级数的收敛域是( )。A. (-1, 1) B. [-1,11] C. [-1,0) D. (-1, 0)

作者: tihaiku 人气: - 评论: 0
问题 级数的收敛域是( )。
选项 A. (-1, 1) B. [-1,11] C. [-1,0) D. (-1, 0)
答案 C
解析 采用排除法求解。当x=0时,原级数可化为,级数是发散的,排除AB两项;当x=-1时,代入可知级数是交错级数,收敛。

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