题目内容
计算下面各题.
|
12÷
|
| ||||||||||||||||
|
|
|
分析:(1)(4)(5)(6)按照从左到右的顺序计算;
(2)(3)先把除法变成乘法,再运用乘法结合律简算.
(2)(3)先把除法变成乘法,再运用乘法结合律简算.
解答:解:(1)
×
×
,
=
×
,
=
;
(2)12÷
×
,
=12×
×
,
=12×(
×
),
=12×
,
=
;
(3)
÷
×
,
=
×
×
,
=
×
,
=
;
(4)
÷
÷
,
=
×
×
,
=6×
,
=25;
(5)
×42×
,
=36×
,
=26;
(6)
×
÷
,
=
×
,
=
.
| 7 |
| 5 |
| 3 |
| 14 |
| 10 |
| 27 |
=
| 3 |
| 10 |
| 10 |
| 27 |
=
| 1 |
| 9 |
(2)12÷
| 8 |
| 9 |
| 8 |
| 15 |
=12×
| 9 |
| 8 |
| 8 |
| 15 |
=12×(
| 9 |
| 8 |
| 8 |
| 15 |
=12×
| 3 |
| 5 |
=
| 36 |
| 5 |
(3)
| 21 |
| 24 |
| 14 |
| 8 |
| 4 |
| 3 |
=
| 21 |
| 24 |
| 8 |
| 14 |
| 4 |
| 3 |
=
| 1 |
| 2 |
| 4 |
| 3 |
=
| 2 |
| 3 |
(4)
| 15 |
| 8 |
| 6 |
| 25 |
| 5 |
| 16 |
=
| 15 |
| 8 |
| 16 |
| 5 |
| 25 |
| 6 |
=6×
| 25 |
| 6 |
=25;
(5)
| 6 |
| 7 |
| 13 |
| 18 |
=36×
| 13 |
| 18 |
=26;
(6)
| 11 |
| 16 |
| 8 |
| 9 |
| 44 |
| 27 |
=
| 11 |
| 18 |
| 27 |
| 44 |
=
| 3 |
| 8 |
点评:本题主要考查了分数乘除法的混合运算,找清运算顺序,合理利用所学的运算定律进行简算.
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