题目内容
通分并比较分数的大小
和
和
.
| 7 |
| 25 |
| 9 |
| 10 |
| 11 |
| 45 |
| 7 |
| 18 |
分析:先求分母的最小公倍数,然后根据分数的基本性质通分,最后比较大小.
解答:解:
=
=
,
=
=
,
<
,
=
=
,
=
=
,
<
.
| 7 |
| 25 |
| 7×2 |
| 25×2 |
| 14 |
| 50 |
| 9 |
| 10 |
| 9×5 |
| 10×5 |
| 45 |
| 50 |
| 7 |
| 25 |
| 9 |
| 10 |
| 11 |
| 45 |
| 11×2 |
| 45×2 |
| 22 |
| 90 |
| 7 |
| 18 |
| 7×5 |
| 18×5 |
| 35 |
| 90 |
| 11 |
| 45 |
| 7 |
| 18 |
点评:此题主要考查通分和分数的大小比较的知识,解答时注意先通分在比较.
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