题目内容
计算
|
|
15÷
| ||||||||||||||||
|
|
13×
|
分析:(2)先把除法变成乘法,再根据乘法交换律简算;其它题目按照从左到右的顺序计算.
解答:解:(1)
÷6÷
,
=
×
×15,
=
×15,
=
;
(2)
×
÷
,
=
×
×
,
=
×
,
=
;
(3)15÷
×
,
=
×
,
=
;
(4)
×
×
,
=
×
,
=
;
(5)
÷
×
,
=16×
,
=8;
(6)13×
×
,
=
×
,
=1.
| 3 |
| 5 |
| 1 |
| 15 |
=
| 3 |
| 5 |
| 1 |
| 6 |
=
| 1 |
| 10 |
=
| 3 |
| 2 |
(2)
| 9 |
| 5 |
| 2 |
| 3 |
| 18 |
| 35 |
=
| 9 |
| 5 |
| 35 |
| 18 |
| 2 |
| 3 |
=
| 7 |
| 2 |
| 2 |
| 3 |
=
| 7 |
| 3 |
(3)15÷
| 9 |
| 25 |
| 4 |
| 5 |
=
| 125 |
| 3 |
| 4 |
| 5 |
=
| 100 |
| 3 |
(4)
| 4 |
| 5 |
| 3 |
| 4 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 2 |
| 9 |
=
| 2 |
| 15 |
(5)
| 4 |
| 3 |
| 1 |
| 12 |
| 1 |
| 2 |
=16×
| 1 |
| 2 |
=8;
(6)13×
| 2 |
| 7 |
| 7 |
| 26 |
=
| 26 |
| 7 |
| 7 |
| 26 |
=1.
点评:本题考查了分数乘除法的混合运算,计算时要细心,注意把结果化成最简分数.
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