题目内容
在括号内填上适当的数.
=
=
=
=
=
=
=
=
.
| 5 |
| 7 |
| 5×( ) |
| 7×( ) |
| 20 |
| 28 |
| 1 |
| 4 |
| 1×( ) |
| 4×( ) |
| 3 |
| 12 |
| 3 |
| 4 |
| 3×( ) |
| 4×( ) |
| 21 |
| 28 |
| 1 |
| 6 |
| 1×( ) |
| 6×( ) |
| 2 |
| 12 |
分析:根据分数的基本性质:分数的分子和分母同时乘或除以一个相同的数(0除外),分数的大小不变;据此解答即可.
解答:解:
=
=
;
=
=
;
=
=
;
=
=
;
故答案为:4,4,3,3,7,7,2,2.
| 5 |
| 7 |
| 5×4 |
| 7×4 |
| 20 |
| 28 |
| 1 |
| 4 |
| 1×3 |
| 4×3 |
| 3 |
| 12 |
| 3 |
| 4 |
| 3×7 |
| 4×7 |
| 21 |
| 28 |
| 1 |
| 6 |
| 1×2 |
| 6×2 |
| 2 |
| 12 |
故答案为:4,4,3,3,7,7,2,2.
点评:此题考查学生对分数基本性质的掌握情况,灵活掌握分数的基本性质,是解答此题的关键.
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