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GIẢ SỬ $ \INT\LIMITS_0^9 {F\LEFT( X \RIGHT){\TEXT{D}}X} = 37$ VÀ $ \INT\LIMITS_9^0 {G\LEFT( X \RIGHT){\TEXT{D}}X} = 16$. KHI ĐÓ, $ I = \INT\LIMITS_0^9 {\LEFT[ {2F\LEFT( X \RIGHT) + 3G(X)} \RIGHT]{\TEXT{D}}X}$ BẰNG: