题目内容
(2007?东城区)
+(
+
)×7.
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 35 |
分析:先运用乘法分配律简算,再运用加法交换律简算.
解答:解:
+(
+
)×7,
=
+
×7+
×7,
=
+6+
,
=
+
+6,
=1+6,
=7.
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 35 |
=
| 2 |
| 5 |
| 6 |
| 7 |
| 3 |
| 35 |
=
| 2 |
| 5 |
| 3 |
| 5 |
=
| 2 |
| 5 |
| 3 |
| 5 |
=1+6,
=7.
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.
练习册系列答案
相关题目