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a) ingat ~ (p⇒q) ≡ p ∧ ~q
~(p⇒(~q∨r) ≡ p ∧ ~ ( ~q∨r)≡ p ∧ (q∧~ r ) selesai
yg lain mirip2 ~ (p ∧q) = ~p∨ ~ q dst