题目内容
1-
-
-
.
| 1 |
| 10 |
| 1 |
| 100 |
| 1 |
| 1000 |
分析:利用减法的性质简算.
解答:解:1-
-
-
,
=1-(
+
+
),
=1-(
+
+
),
=1-
,
=
.
| 1 |
| 10 |
| 1 |
| 100 |
| 1 |
| 1000 |
=1-(
| 1 |
| 10 |
| 1 |
| 100 |
| 1 |
| 1000 |
=1-(
| 100 |
| 1000 |
| 10 |
| 1000 |
| 1 |
| 1000 |
=1-
| 111 |
| 1000 |
=
| 889 |
| 1000 |
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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