Răspunsuri

2014-11-03T15:24:24+02:00
1.p∨q⇔q∨p
2.p∧q⇔q∧p
3.p∧(q∨r)⇔(p∧q)∨(p∧r)
4.non(p∧q)⇔non p ∨ non q
5.non (p∨q)⇔non p ∧ non q