题目内容
下面的分数化成小数,(除不尽的保留两位小数).
2
3
.
7 |
25 |
5 |
8 |
3 |
20 |
7 |
11 |
13 |
40 |
7 |
9 |
分析:分数化小数的方法:用分数的分子除以分母,除不尽时通常保留两位小数,据此解答.
解答:解:
=7÷25=0.28;
2
=
=21÷8=2.625;
3
=
=63÷20=3.15;
=7÷11≈0.64;
=13÷40=0.325;
=7÷9≈0.78.
故答案为:0.28,2.625,3.15,0.64,0.325,0.78.
7 |
25 |
2
5 |
8 |
21 |
8 |
3
3 |
20 |
63 |
20 |
7 |
11 |
13 |
40 |
7 |
9 |
故答案为:0.28,2.625,3.15,0.64,0.325,0.78.
点评:此题考查分数化小数的方法:用分数的分子除以分母.
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