题目内容
观察下面的式子．
=
=0.2
=
=0.4
=
=0.15
=
=0.26
你能用上面的方法把下面的分数化成小数吗？试一试．
=
=
=
=
=
=
=
=
=
=
=
=
| 1 |
| 5 |
| 2 |
| 10 |
| 2 |
| 5 |
| 4 |
| 10 |
| 3 |
| 20 |
| 15 |
| 100 |
| 13 |
| 50 |
| 26 |
| 100 |
你能用上面的方法把下面的分数化成小数吗？试一试．
| 3 |
| 5 |
| () |
| () |
| 7 |
| 20 |
| () |
| () |
| 11 |
| 20 |
| () |
| () |
| 3 |
| 25 |
| () |
| () |
| 12 |
| 25 |
| () |
| () |
| 27 |
| 50 |
| () |
| () |
分析：通过观察例子发现，把分数化成小数，可以根据分数的基本性质，先把分数化成分母是10、100…的分数，然后把分母是10、100…分数化成小数即可．
解答：解：
=
=0.6；
=
=0.35；
=
=0.55；
=
=0.12；
=
=0.48；
=
=0.54．
| 3 |
| 5 |
| 6 |
| 10 |
| 7 |
| 20 |
| 35 |
| 100 |
| 11 |
| 20 |
| 55 |
| 100 |
| 3 |
| 25 |
| 12 |
| 100 |
| 12 |
| 25 |
| 48 |
| 100 |
| 27 |
| 50 |
| 54 |
| 100 |
点评：此题考查的目的是理解掌握分数的基本性质和分数化成小数的方法．
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