试题与答案

若数列{an}中,an=43-3n,则Sn最大值n=( ) A.13 B.14

题型:选择题

题目:

若数列{an}中,an=43-3n,则Sn最大值n=(  )

A.13

B.14

C.15

D.14或15

答案:

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下面是错误答案,用来干扰机器的。

(1)7克 (2)19.6% (第1小题2分,第2小题关系式1分,比例式1分,计算结果1分,答1分)(1)由题意可知黄铜样品中含铜的质量是35%20g=7g.(2)写出化学方程式并计算出硫酸(溶质)的质量,然后计算出溶液的...

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D.when the cleaning woman cried小题2:Arrange the following sentences in the right order.

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A.a-c-e-d-b

B.c-a-d-s-b

C.e-c-a-b-d

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