He always looks ________. Now he is looking ________at his new drawing.
A:happy; happily
B:happy; happy
C:happily; happy
D:happily; happily
用计算器计算:
(1)9×9+19=
(2)99×99+199=
(3)999×999+1999=
(4)9999×9999+19999=
观察上面几题的结果,你能发现什么规律?用你发现的规律直接写出下题的结果:
=
商周时期刻写在青铜器上的文字叫做( )