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lianx2 - 1(1(A B B(B A A(2(A B C(A C C(3(A B C(C A(D...

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1. (1) ( A B ) B ( B A ) A ; (2) ( A B ) C ( A C ) C ; * (3) ( A B ) C ) ( C A ) ( D A ); 1 (4) ( A ∧ ¬ B ) ( D C ) , B → ¬ A, A → ¬ C A D. 2. (1) ¬ ( A B ) ‘ ¬ A ∧ ¬ B ; (2) ¬ ( A B ) ‘ ¬ A ∨ ¬ B ; (3) A
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