题目内容
将下列分数化成小数,如果不能化成有限小数,将其保留三位小数.
=
=
=
=
2 |
5 |
0.4
0.4
;5 |
9 |
0.556
0.556
;19 |
40 |
0.475
0.475
;2 |
15 |
0.133
0.133
.分析:把分数化小数,用分数的分子除以分母即得小数商,除不尽时按照要求保留三位小数.
解答:解:
=2÷5=0.4;
=5÷9≈0.556;
=19÷40=0.475;
=2÷15≈0.133.
故答案为:0.4,0.556,0.475,0.133.
2 |
5 |
5 |
9 |
19 |
40 |
2 |
15 |
故答案为:0.4,0.556,0.475,0.133.
点评:此题考查分数化小数方法的灵活运用,属于基本题,要掌握方法.
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