题目内容
计算:2007÷2007
+
.
| 2007 |
| 2008 |
| 1 |
| 2009 |
2007÷2007
+
=2007×
+
.
=2007×
+
=
+
=1.
| 2007 |
| 2008 |
| 1 |
| 2009 |
=2007×
| 2008 |
| 2007×2008+2007 |
| 1 |
| 2009 |
=2007×
| 2008 |
| 2007×(2008+1) |
| 1 |
| 2009 |
=
| 2008 |
| 2009 |
| 1 |
| 2009 |
=1.
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