题目内容
用简便方法计算.
+
+
+
-
-
.
| 11 |
| 12 |
| 5 |
| 8 |
| 1 |
| 8 |
| 1 |
| 12 |
| 4 |
| 27 |
| 3 |
| 27 |
分析:根据加法交换律和结合律,以及连减的性质进行简算即可.
解答:解:
+
+
+
-
-
,
=(
+
)+(
+
)-(
+
),
=1+
-
,
=1
-
,
=1
.
| 11 |
| 12 |
| 5 |
| 8 |
| 1 |
| 8 |
| 1 |
| 12 |
| 4 |
| 27 |
| 3 |
| 27 |
=(
| 11 |
| 12 |
| 1 |
| 12 |
| 5 |
| 8 |
| 1 |
| 8 |
| 4 |
| 27 |
| 3 |
| 27 |
=1+
| 3 |
| 4 |
| 7 |
| 27 |
=1
| 3 |
| 4 |
| 7 |
| 27 |
=1
| 53 |
| 108 |
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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