1.Which Boolean formula is not a tautology??
A.(A=>B)=>(B=>A)
B.A=>(~A=>B)
C.(A=>A)=>(B=>B)
2.在布林代數中，xyz+x'y'z+xy'z'+x'yz'=?
A. x ⊕ y ⊕ z
B. x'⊕ y ⊕ z
C. x ⊕ y'⊕ z
D. x ⊕ y ⊕ z'
3.正邏輯的AND閘 相當於負邏輯的OR閘
why= =?? 為啥不是NAND??
4.xz+x'yz = z(x+x'y)
= z(x+x')(x+y) <==這裡開始看不懂 為啥(x+x'y)可以拆成(x+x')(x+y)??
= z(x+y)
= zx+yz
謝謝大家!