题目内容
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
分析:通过观察,此题运用加法交换律与结合律简算.
解答:解:
+2
+
+3
,
=(
+
)+(2
+3
),
=1+6,
=7.
| 3 |
| 4 |
| 9 |
| 17 |
| 1 |
| 4 |
| 8 |
| 17 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=1+6,
=7.
点评:完成此题,应认真分析数据,应用运算定律进行简便计算
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| 1 |
| 4 |
| 8 |
| 17 |
| 3 |
| 4 |
| 9 |
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| 17 |
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