题目内容
计算下面各题.
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分析:(1)计算分数乘法时,把因数的分母和分子交叉约分后再乘;
(2)计算分数除法时,把分数除法转化为分数乘法,再按照分数乘法的方法进行计算.
(2)计算分数除法时,把分数除法转化为分数乘法,再按照分数乘法的方法进行计算.
解答:解:
×21×
,
=15×
,
=
;
÷5×
,
=
×
×
,
=
,
÷
÷
,
=
×
×
,
=2,
÷
÷24,
=
×
×
,
=
,
×
÷8,
=
×
,
=
.
| 5 |
| 7 |
| 3 |
| 10 |
=15×
| 3 |
| 10 |
=
| 9 |
| 2 |
| 4 |
| 9 |
| 5 |
| 6 |
=
| 4 |
| 9 |
| 1 |
| 5 |
| 5 |
| 6 |
=
| 2 |
| 27 |
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 12 |
=
| 7 |
| 8 |
| 4 |
| 3 |
| 12 |
| 7 |
=2,
| 8 |
| 5 |
| 5 |
| 9 |
=
| 8 |
| 5 |
| 9 |
| 5 |
| 1 |
| 24 |
=
| 3 |
| 25 |
| 4 |
| 3 |
| 1 |
| 8 |
=
| 1 |
| 6 |
| 1 |
| 8 |
=
| 1 |
| 48 |
点评:此题考查分数乘、除法的计算方法.
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