题目内容
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
分析:根据减法的性质:减去两个数的和,等于连续减去这两个数简算.
解答:解:
-(
+
),
=
-
-
,
=
-
,
=
.
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
=
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
=
| 2 |
| 3 |
| 4 |
| 7 |
=
| 2 |
| 21 |
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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题目内容
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
| 8 |
| 9 |
| 2 |
| 9 |
| 4 |
| 7 |
| 2 |
| 3 |
| 4 |
| 7 |
| 2 |
| 21 |