题目内容
计算:
-(4
-0.5).
| 13 |
| 2 |
| 1 |
| 3 |
分析:先去掉括号,然后运用加法交换律简算;去括号时注意运算符号的变化.
解答:解:
-(4
-0.5),
=
-(4
-
),
=
-4
+
,
=
+
-4
,
=7-4
,
=2
.
| 13 |
| 2 |
| 1 |
| 3 |
=
| 13 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
=
| 13 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
=
| 13 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
=7-4
| 1 |
| 3 |
=2
| 2 |
| 3 |
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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