题目内容
计算下面各题.
÷
×
;
÷
÷
; 25×
×
;
×
÷
×
.
| 15 |
| 16 |
| 5 |
| 8 |
| 3 |
| 4 |
| 3 |
| 5 |
| 27 |
| 5 |
| 8 |
| 3 |
| 2 |
| 27 |
| 3 |
| 5 |
| 5 |
| 6 |
| 6 |
| 5 |
| 5 |
| 6 |
| 6 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算乘法.
(2)按从左到右的顺序根据分数除法的运算法则计算即可.
(3)可根据乘法交换律计算.
(4)可根据乘法交换律计算.
(2)按从左到右的顺序根据分数除法的运算法则计算即可.
(3)可根据乘法交换律计算.
(4)可根据乘法交换律计算.
解答:
解:(1)
÷
×
=
×
=
;
(2)
÷
÷
=
÷
=
;
(3)25×
×
=25×
×
=15×
=
;
(4)
×
÷
×
=
÷
×
×
=1×
×
=
.
| 15 |
| 16 |
| 5 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 2 |
| 3 |
| 4 |
=
| 9 |
| 8 |
(2)
| 3 |
| 5 |
| 27 |
| 5 |
| 8 |
| 3 |
=
| 1 |
| 9 |
| 3 |
| 8 |
=
| 8 |
| 27 |
(3)25×
| 2 |
| 27 |
| 3 |
| 5 |
=25×
| 3 |
| 5 |
| 2 |
| 27 |
=15×
| 2 |
| 27 |
=
| 10 |
| 9 |
(4)
| 5 |
| 6 |
| 6 |
| 5 |
| 5 |
| 6 |
| 6 |
| 5 |
=
| 5 |
| 6 |
| 5 |
| 6 |
| 6 |
| 5 |
| 6 |
| 5 |
=1×
| 6 |
| 5 |
| 6 |
| 5 |
=
| 36 |
| 25 |
点评:完成本题要注意约分,同时要注意分析式中数据,能简便计算的要简便计算.
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