5.等差數(shù)列前四項(xiàng)和為40, 末四項(xiàng)和為72, 所有項(xiàng)和為140, 則該數(shù)列共有 ( ) A.9項(xiàng) B.12項(xiàng) C.10項(xiàng) D.13項(xiàng) 查看更多

 

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等差數(shù)列{an}前四項(xiàng)和為40,末四項(xiàng)和為72,所有項(xiàng)和為140,則該數(shù)列共有( 。

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等差數(shù)列{an}前四項(xiàng)和為40,末四項(xiàng)和為72,所有項(xiàng)和為140,則該數(shù)列共有(    )

A.9項(xiàng)                 B.12項(xiàng)                C.10項(xiàng)                   D.13項(xiàng)

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等差數(shù)列{an}前四項(xiàng)和為40,末四項(xiàng)和為72,所有項(xiàng)和為140,則該數(shù)列共有(    )

A.9項(xiàng)                 B.12項(xiàng)              C.10項(xiàng)             D.13項(xiàng)

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等差數(shù)列{an}前四項(xiàng)和為40,末四項(xiàng)和為72,所有項(xiàng)和為140,則該數(shù)列共有(    )

A.9項(xiàng)                B.12項(xiàng)         C.10項(xiàng)               D.13項(xiàng)

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等差數(shù)列{an}前四項(xiàng)和為40,末四項(xiàng)和為72,所有項(xiàng)和為140,則該數(shù)列共有


  1. A.
    9項(xiàng)
  2. B.
    10項(xiàng)
  3. C.
    12項(xiàng)
  4. D.
    13項(xiàng)

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