题目内容
20×
|
|
|
|
分析:(1)运用乘法结合律简算;
(2)(3)(4)按照从左到右的顺序计算.
(2)(3)(4)按照从左到右的顺序计算.
解答:解:(1)20×
×
,
=20×(
×
),
=20×
,
=
;
(2)
×
×
,
=
×
,
=
;
(3)
×14×
,
=4×
,
=
;
(4)
×
×
,
=
×
,
=
.
| 5 |
| 6 |
| 3 |
| 4 |
=20×(
| 5 |
| 6 |
| 3 |
| 4 |
=20×
| 5 |
| 8 |
=
| 25 |
| 2 |
(2)
| 2 |
| 5 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 1 |
| 3 |
| 3 |
| 8 |
=
| 1 |
| 8 |
(3)
| 2 |
| 7 |
| 5 |
| 8 |
=4×
| 5 |
| 8 |
=
| 5 |
| 2 |
(4)
| 9 |
| 10 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 3 |
| 5 |
| 5 |
| 6 |
=
| 1 |
| 2 |
点评:本题考查了分数连乘的计算,也可以把乘数的分子和分母约分求解.
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