题目内容
通分.
和
和
和
和
.
| 1 |
| 2 |
| 6 |
| 7 |
| 5 |
| 8 |
| 3 |
| 4 |
| 7 |
| 12 |
| 5 |
| 16 |
| 5 |
| 8 |
| 7 |
| 24 |
考点:约分和通分
专题:运算顺序及法则
分析:先分别找出每一组分数的分母的最小公倍数,再利用分数的基本性质将它们化为同分母分数,即可解答问题.
解答:
解:(1)
=
=
=
=
;
(2)
=
=
;
(3)
=
=
=
=
;
(4)
=
=
.
| 1 |
| 2 |
| 1×7 |
| 2×7 |
| 7 |
| 14 |
| 6 |
| 7 |
| 6×2 |
| 7×2 |
| 12 |
| 14 |
(2)
| 5 |
| 8 |
| 3 |
| 4 |
| 3×2 |
| 4×2 |
| 6 |
| 8 |
(3)
| 7 |
| 12 |
| 7×4 |
| 12×4 |
| 28 |
| 48 |
| 5 |
| 16 |
| 5×3 |
| 16×3 |
| 15 |
| 48 |
(4)
| 5 |
| 8 |
| 5×3 |
| 8×3 |
| 15 |
| 24 |
| 7 |
| 24 |
点评:此考查了利用分数的基本性质将异分母分数化成同分母分数的灵活应用.
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