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【简答题】
已知数列 ,其中 。 为前n项和,对于任意的自然数 , 与2的等差中项等于 与2的等比中项。 (1)求 的值;(2)证明:数列 是等差数列。
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反馈参考答案：
举一反三
【简答题】—and he lived quite simply, always wearing his same old second-hand suit—they often treated him with 6 .
【简答题】Once upon a time, there was a poor boy working for a king day and night, but the king treated him badly. Every day, the boy went cold and hungry, so he ran away. Then one day, he met a big lion in the...
【单选题】After he won all the money they treated him ______a king.
A.
like
B.
as
C.
as if
D.
seemed
【简答题】停经2月后不规则阴道流血,伴阵发性下腹疼痛( ) 停经56天后突发下腹一侧撕裂样剧痛,少量阴道流血( ) 妊娠晚期或临产时无诱因、无痛性阴道流血( ) 妊娠晚期外伤后突发持续性腹痛和阴道流血( ) A:异位妊娠 B:前置胎盘 C:胎盘早剥 D:自然流产 E:早产
【单选题】 They treated him ____________ a king when he won all that money.
A.
as
B.
as being
C.
like
D.
like he was
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