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CHO $ \INT\LIMITS_A^C {F\LEFT( X \RIGHT){\TEXT{D}}X} = 17$ VÀ $ \INT\LIMITS_B^C {F\LEFT( X \RIGHT){\TEXT{D}}X} = – 11$ VỚI $ A < B < C$. TÍNH $ I = \INT\LIMITS_A^B {F\LEFT( X \RIGHT){\TEXT{D}}X}$ .