幂级数的收敛域为( )。

作者: tihaiku 人气: - 评论: 0
问题 幂级数的收敛域为( )。
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答案 B
解析 令x2=t,幂级数化为当|t|<2,即|x2|<2,亦即时收敛,而当发散,而当时,级数∑(2n-1)发散,从而原级数的收敛域为

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  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
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