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问题
解答题
用竖式计算.
49×9=
78×6=
87×5=
137×6=
259×7=
答案
49×9=441
78×6=468
87×5=435
137×6=822
259×7=1813
填空题
一组数:31、40、38、45、50,它们的平均数是______,中位数是______.
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选择题
— ______ have they stayed in our school?
— For twelve years.
A. How long
B. How often
C. How soon
D. How many
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