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1. 数与代数
第2课时 数的认识(2)
整理和复习
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(1)2008年8月3日,我国气象部门在新疆吐鲁番盆地的艾丁湖观测到了我国极端最高气温是49.7℃,可记作( )℃。1969年2月13日,我国气象部门在黑龙江漠河观测到了我国极端最低气温是零下52.3℃,可记作( )℃。
49.7
-52.3
一、填空。
一
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(2)如果a÷b=c(a、b、c均为整数,且b≠0),那么a和b的最大公因数是( ),最小公倍数是( )。
(3)一种商品打七折销售,“七折”表示原价的( )%。如果这种商品原价是100元,付款时要少付( )元。
70
30
b
a
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2.下表是有关中国、美国、俄罗斯和印度的陆地面积和人口数的近似数据。
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(1)中国的人口居世界第一,人口数约为( )亿,印度人口数约为( )亿。(结果保留一位小数。)
(2)俄罗斯的陆地面积居世界第一,约为( )万平方千米,美国的陆地面积约为( )万平方千米。(结果保留一位小数。)
(3)根据上表,你能提出一个数学问题吗?
13.4
12.2
1707.5
937.3
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3.说出下面各数中“2”的含义。
23
0.52
203.7
2
3
表示2个十
表示2个百分之一
表示2个三分之一
表示2个百
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www.