'Ab ab bc ac' diaporamas de présentation

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?? ???. ????. ? ???. (1) F=(A+B)(A B) = A B. (2) F=A+ABC+ABC+CB+C B = A+BC+BC. (3) F=AB+A B+AB+AB = 0. (4) F=(A+B+C)(A+B+C) = (A+B)+CC = A+B. (5) F=ABCD+ABD+BCD+ABCD+BC = AB+BC+BD. (6) F=AC+ABC+BC+ABC = BC. (7) F=AB+ABC+A(B+AB) = 0. (8) F=(A+B)+(A+B)+ (AB)(AB) = 0. ???????????????.

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