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1,2,3,0,1.5,9都是自然数.
错误
错误
分析:根据自然数的意义:用来表示物体个数的数0、1、2、3、4、…,叫做自然数,据此判断.
解答:解:由分析可知:1,2,3,0,1.5,9都是自然数,说法错误,因为1.5是小数;
故答案为:错误.
点评:此题考查的没事是理解掌握自然数的意义.明确:最小的自然数是0.
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(2)3.8+2.5+6.2=
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(3)
8
9
+
1
9
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2
7
=
5
7
5
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180
180
    79+2.1=
81.1
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(4)3.14×3=
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6
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4.4
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100.9
100.9
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0.12
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20
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31
31
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52
52
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18
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320
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84
84
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28
28
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3.2
3.2
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50
50
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4
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2
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50
50
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10
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