问题 解答题
把下列的小数化成分数,把分数化成小数(不能化成有限小数的保留两位小数).
0.4=0.05=0.37=0.45=0.013=
37
100
=
9
20
=
31
40
=
7
30
=
51
70
=
答案

0.4=

4
10
=
2
5
; 0.05=
5
100
=
1
20
; 0.37=
37
100
; 0.45=
45
100
=
9
20
; 0.013=
13
1000

37
100
=37÷100=0.37;
9
20
=9÷20=0.45;
31
40
=31÷40=0.775;
7
30
=7÷30≈0.23;
51
70
=51÷70≈0.73.

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