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        1. 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) 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)

          查看答案和解析>>

          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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          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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