题目内容
(1)把下面的分数化成分母是24且大小不变的分数.
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=
=
(2)把下面的分数化成分母是60而大小不变的分数.
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=
=
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 8 |
(2)把下面的分数化成分母是60而大小不变的分数.
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 12 |
分析:本题根据分数的基本性质将题目中的分数按要求通分即可.
解答:解:(1)
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=
;
=
=
;
=
=
.
(2)
=
=
;
=
=
;
=
=
.
| 2 |
| 3 |
| 2×8 |
| 3×8 |
| 16 |
| 24 |
| 1 |
| 4 |
| 1×6 |
| 4×6 |
| 6 |
| 24 |
| 5 |
| 8 |
| 5×3 |
| 8×3 |
| 15 |
| 24 |
(2)
| 3 |
| 4 |
| 3×15 |
| 4×15 |
| 45 |
| 60 |
| 2 |
| 3 |
| 2×20 |
| 3×20 |
| 40 |
| 60 |
| 5 |
| 12 |
| 5×5 |
| 12×5 |
| 25 |
| 60 |
点评:分数的基本性质:分数的分子与分母同时扩大或缩小相同的倍数(0除外),分数的大小不变.
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