题目内容
| 2007+2006×2008 |
| 2007×2008-1 |
| 2008+2007×2009 |
| 2008×2009-1 |
| 2007+2006×2008 |
| 2007×2008-1 |
| 2008+2007×2009 |
| 2008×2009-1 |
=
| 2008-1+2006×2008 |
| 2007×2008-1 |
| 2009-1+2007×2009 |
| 2008×2009-1 |
=
| 2008×(1+2006)-1 |
| 2007×2008-1 |
| 2009×(1+2007)-1 |
| 2008×2009-1 |
=
| 2007×2008-1 |
| 2007×2008-1 |
| 2008×2009-1 |
| 2008×2009-1 |
=1+1,
=2.
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