题目内容
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 6 |
分析:先同时运算小括号里面的加法和减法,再算中括号里面的加法和减法,最后算括号外的除法.
解答:解:
÷[(
+
)+(
-
)-
],
=
÷[
+0-
],
=
÷
,
=2.
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 7 |
| 6 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 3 |
=2.
点评:一个算式里,如果有括号,要先算小括号里的,再算中括号里面的,最后算括号外的运算.
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