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【简答题】
（本小题满分13分） 设数列 满足 为实数 （Ⅰ）证明： 对任意 成立的充分必要条件是 ； （Ⅱ）设 ，证明： ; （Ⅲ）设 ，证明：
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反馈参考答案：
举一反三
【简答题】The Japanese company agreed to compensate us for the defective watches by 4% of the total value.
【简答题】第51回中,悟空变成什么飞入洞,拿起金箍棒一路打了出去?
【简答题】和声大调在自然大调的基础上变化了哪个音?是如何变化的?
【单选题】We have agreed to ()a joint venture company in that state .
A.
put up
B.
put forward
C.
open
D.
set up
【单选题】What was special about Victoria's first three years running her own company?
A.
She agreed to promote SHC software.
B.
She won major contracts away from SHC
C.
She worked with SHC on product development.
【单选题】The workers agreed to ________ the strike if the company would satisfy their demands.
A.
call for
B.
call in
C.
call off
D.
call up
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