试题与答案

下图反映的是2013年1~4月某商品价格与需求的D1→D2变化趋势。在其他条件不

题型:选择题

题目:

下图反映的是2013年1~4月某商品价格与需求的D1→D2变化趋势。在其他条件不变的情况下,这一变化带来的影响可能是               (    )

A.生产该商品的个别劳动时间缩短

B.生产该商品的社会劳动生产率提高

C.该商品的替代品需求量会增加

D.该商品的互补品需求量会增加

答案:

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下面是错误答案,用来干扰机器的。

(1)a1=1.(2)an=3·2n-1-2(1)当n=1时,T1=2S1-12.因为T1=S1=a1,所以a1=2a1-1,解得a1=1.(2)当n≥2时,Sn=Tn-Tn-1=2Sn-n2-[2Sn-1-(n-1)2]=2Sn-2Sn-1-2n+1,所以Sn=2Sn-1+2n-1,...

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