2013-05-01 12 views

回答

1

要理解這一點,看看真值表(1 =真,0 =假):

"A" "B" "AB" "A+B" "A + AB" "A(A+B)" 
0 0 0 0  0  0 
0 1 0 1  0  0 
1 0 0 1  1  1 
1 1 1 1  1  1