Ngày tải lên :
12/09/2012, 16:20
... (1, 2) , (1,3), (2, 2), (2, 1), (2, 3), (3,3)}
o. {(1, 1), (3,3), (2, 3), (2, 1), (3 ,2) , (1,3)}
p. {(1,1), (1 ,2) , (2, 1), (2, 2), (3,3), (4,4)}
q. {(1, 1), (2, 2) , (3,3), (4,4), (2, 1), (2, 3), (3,1)}
21 , ... 1), (1, 2) , (1,3), (2, 2), (2, 1), (2, 3), (3,3)}
f. {(1, 1), (3,3), (2, 3), (2, 1), (3 ,2) , (1,3)}
g. {(1,1), (1 ,2) , (2, 1), (2, 2), (3,3), (4,4)}
h. {(1, 1), (2, 2) , (3,3), (4,4), (2, 1), (2, 3), (3,1)}
18, ... dưới đây, tập nào là một quan
hệ 2 ngôi từ A tới B?
a.{(1,a), (1,1), (2, a)}
b.{ (2, 2) , (2, 3), (3,b)}
c.{(1 ,2) , (2, 2), (3,a)}
d.{ (2, c), (2, 2), (b,3)}
e.Tất cả đều sai.
13. Cho G = (V, E) là đồ...