题目内容
把下列分数化成和原来分数相等的同分母的分数．
①
和
②
和
③
和
．
①
| 2 |
| 3 |
| 4 |
| 5 |
②
| 7 |
| 21 |
| 4 |
| 7 |
③
| 5 |
| 8 |
| 7 |
| 12 |
①
=
=
，
=
=
；
②
=
，
=
=
；
③
=
=
，
=
=
．
| 2 |
| 3 |
| 2×5 |
| 3×5 |
| 10 |
| 15 |
| 4 |
| 5 |
| 4×3 |
| 5×3 |
| 12 |
| 15 |
②
| 7 |
| 21 |
| 7 |
| 21 |
| 4 |
| 7 |
| 4×3 |
| 7×3 |
| 12 |
| 21 |
③
| 5 |
| 8 |
| 5×3 |
| 8×3 |
| 15 |
| 24 |
| 7 |
| 12 |
| 7×2 |
| 12×2 |
| 14 |
| 24 |
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