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【简答题】
阅读下列计算过程： 9×9+19=9 2 +2×9+1=（9+1） 2 =10 2 99×99+199=99 2 +2×99+1=（99+1） 2 =100 2 =10 4 计算：999×999+1999=______=______=______=______ 9999×9999+19999=______=______=______=______ 猜想： 999…9 n × 999…9 n +1 999…9 n 等于多少？
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举一反三
【单选题】Neither of the young men who had applied for a position in the university ______.
A.
has been accepted
B.
have been accepted
C.
was accepted
D.
were accepted
【单选题】The four teams are , and the race will start soon.
A.
in position
B.
in public
C.
in practice
D.
in return
【单选题】How are the teams assigned to the four positions in a BP style debate?
A.
They pick their positions themselves.
B.
They are assigned to the positions randomly.
C.
They are assigned to the positions by the chair.
D.
They are assigned to the positions by the audience.