题目内容
用简便方法计算
2006÷
.
2006÷
| 2007 |
| 2008 |
2006÷
,
=×
,
=2007×
-
,
=2008-
,
=2006
.
| 2007 |
| 2008 |
=×
| 2008 |
| 2007 |
=2007×
| 2008 |
| 2007 |
| 2008 |
| 2007 |
=2008-
| 2008 |
| 2007 |
=2006
| 2006 |
| 2007 |
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