题目内容
计算.
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)(3)根据分数乘法,直接约分计算即可;
(4)(5)(6)把除法化成乘法,再根据分数乘法,直接约分计算即可.
(4)(5)(6)把除法化成乘法,再根据分数乘法,直接约分计算即可.
解答:
解:(1)
×13
=
=
;
(2)
×
=
=
;
(3)
×
×
=
=
;
(4)
×12÷
=
×12×
=
=10;
(5)
÷4÷
=
×
×12
=
=
;
(6)
×26÷
=
×26×
=
=6.
| 15 |
| 26 |
=
| 15×13 |
| 26 |
=
| 15 |
| 2 |
(2)
| 24 |
| 35 |
| 7 |
| 8 |
=
| 24×7 |
| 35×8 |
=
| 3 |
| 5 |
(3)
| 1 |
| 4 |
| 8 |
| 9 |
| 6 |
| 5 |
=
| 1×8×6 |
| 4×9×5 |
=
| 4 |
| 15 |
(4)
| 2 |
| 3 |
| 4 |
| 5 |
=
| 2 |
| 3 |
| 5 |
| 4 |
=
| 2×12×5 |
| 3×4 |
=10;
(5)
| 2 |
| 5 |
| 1 |
| 12 |
=
| 2 |
| 5 |
| 1 |
| 4 |
=
| 2×1×12 |
| 5×4 |
=
| 6 |
| 5 |
(6)
| 40 |
| 13 |
| 40 |
| 3 |
=
| 40 |
| 13 |
| 3 |
| 40 |
=
| 40×26×3 |
| 13×40 |
=6.
点评:本题主要考查了分数乘法、除法的计算方法,注意结果要化成最简分数.
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