Cho lăng trụ tam giác $ABC.A^{\prime }{B}^{\prime }{C}^{\prime }$ có thể tích là $V$ . Gọi $M$ là trung điểm cạnh $A{A}^{\prime }$ . Khi đó thể tích khối chóp $M.BC{C}^{\prime }{B}^{\prime }$ là

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