题目内容
把下面各分数约分
.
| 12 |
| 16 |
| 21 |
| 28 |
| 36 |
| 90 |
| 48 |
| 54 |
| 13 |
| 91 |
(1)
=
=
;
(2)
=
=
;
(3)
=
=
;
(4)
=
=
;
(5)
=
=
.
| 12 |
| 16 |
| 12÷4 |
| 16÷4 |
| 3 |
| 4 |
(2)
| 21 |
| 28 |
| 21÷7 |
| 28÷7 |
| 3 |
| 4 |
(3)
| 36 |
| 90 |
| 36÷18 |
| 90÷18 |
| 2 |
| 5 |
(4)
| 48 |
| 54 |
| 48÷6 |
| 54÷6 |
| 8 |
| 9 |
(5)
| 13 |
| 91 |
| 13÷13 |
| 91÷13 |
| 1 |
| 7 |
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