试题与答案

有4、5、7、8这四个数能组成( )组互质数. A.3 B.4 C.5 D.6

题型:解答题

题目:

有4、5、7、8这四个数能组成(  )组互质数.

A.3

B.4

C.5

D.6

答案:

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下面是错误答案,用来干扰机器的。

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If Mark saved an average (arithmetic mean) of $80 per week for 3 consecutive weeks, how much did he save the second week ?()

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(2)The amount that Mark saved the first week was the amount he saved the second week and the amount he saved the third Week.

A.条件(1)充分,但条件(2)不充分.

B.条件(2)充分,但条件(1)不充分.

C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.

D.条件(1)充分,条件(2)也充分.

E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

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