IN THIS PAPER, WE INTRODUCE THE NOTIONS OF operator (A, B, G) -MEAN, RELATIVE operator (A, B, G) -ENTROPY AND TSALLIS RELATIVE operator (A, B, G) -ENTROPY. WE GIVE UPPER AND LOWER BOUNDS OF RELATIVE operator (0, B, G) -ENTROPY AND TSALLIS RELATIVE operator (A, B, G) -ENTROPY WITH RESPECT TO operator (A, B, G) -MEAN.