题目内容
计算:
12×(
|
(
|
考点:运算定律与简便运算
专题:运算定律及简算
分析:通过观察,这两道题都可以运用乘法分配律简算.
解答:
解:(1)12×(
-
+
)
=12×
-12×
+12×
=6-4+3
=5
(2)(
-
)×
=
×
-
×
=
-
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12×
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=6-4+3
=5
(2)(
| 11 |
| 12 |
| 5 |
| 7 |
| 7 |
| 11 |
=
| 7 |
| 11 |
| 11 |
| 12 |
| 5 |
| 7 |
| 7 |
| 11 |
=
| 7 |
| 12 |
| 5 |
| 11 |
=
| 17 |
| 132 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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