题目内容
| 用简便方法计算. (1)8-
|
(2)77×
|
分析:(1)运用减法性质解答,
(2)运用乘法分配律解答.
(2)运用乘法分配律解答.
解答:解:(1)8-
÷
-
,
=8-(
+
),
=8-4,
=4;
(2)77×
+23×
,
=(77+23)×
,
=100×
,
=80.
| 2 |
| 3 |
| 1 |
| 4 |
| 4 |
| 3 |
=8-(
| 8 |
| 3 |
| 4 |
| 3 |
=8-4,
=4;
(2)77×
| 4 |
| 5 |
| 4 |
| 5 |
=(77+23)×
| 4 |
| 5 |
=100×
| 4 |
| 5 |
=80.
点评:正确运用简便算法解决问题是本题考查知识点.
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