题目内容
简便运算.
|
|
36×
|
考点:分数的简便计算
专题:运算定律及简算
分析:(1)根据乘法交换律和结合律简算即可;
(2)根据乘法分配律简算即可;
(3)把36分成35+1,然后根据乘法分配律简算即可.
(2)根据乘法分配律简算即可;
(3)把36分成35+1,然后根据乘法分配律简算即可.
解答:
解:(1)
×(15×
)×
=(
×
)×(15×
)
=
×2
=
(2)
×103-
×2-
=
×(103-2-1)
=
×100
=28
(3)36×
=(35+1)×
=35×
+
=34+
=34
| 2 |
| 27 |
| 27 |
| 28 |
| 2 |
| 15 |
=(
| 2 |
| 27 |
| 27 |
| 28 |
| 2 |
| 15 |
=
| 1 |
| 14 |
=
| 1 |
| 7 |
(2)
| 7 |
| 25 |
| 7 |
| 25 |
| 7 |
| 25 |
=
| 7 |
| 25 |
=
| 7 |
| 25 |
=28
(3)36×
| 34 |
| 35 |
=(35+1)×
| 34 |
| 35 |
=35×
| 34 |
| 35 |
| 34 |
| 35 |
=34+
| 34 |
| 35 |
=34
| 34 |
| 35 |
点评:此题主要考查了乘法运算定律的运用.
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