44,54,65,77,______ ()
A.91
B.90
C.89
D.88
44,54,65,77,()A.91B.90C.89D.88
44,54,65,77,() A.91B.90C.89D.88
44, 54, 65, 77, () A.91 B.90 C.89 D.88
44,54,65,77,() A.91 B.90C.89 D.88
44,54,65,77,()。 A.91B.90C.89D.88
考虑到对称性,井字棋最终局面有____种不相同的可能A.138B.44C.91D.19683