题目内容
35
-(11
+20
)-2
.
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
分析:先去括号,运用加法交换律与结合律简算.
解答:解:35
-(11
+20
)-2
,
=35
-11
-20
-2
,
=(35
-20
)-(11
+2
),
=15-14,
=1.
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
=35
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
=(35
| 7 |
| 8 |
| 7 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=15-14,
=1.
点评:完成此题,注意分析数据,运用运算定律灵活简算.
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