计算:
| 2008+2007×2009 |
| 2008×2009-1 |
+
| 2009+2008×2010 |
| 2009×2010-1 |
+
| 2010+2009×2011 |
| 2010×2011-1 |
+
| 2011+2010×2012 |
| 2011×2012-1 |
= ___ .
人气:327 ℃ 时间:2019-08-19 01:33:42
解答
| 2008+2007×2009 |
| 2008×2009-1 |
+
| 2009+2008×2010 |
| 2009×2010-1 |
+
| 2010+2009×2011 |
| 2010×2011-1 |
+
| 2011+2010×2012 |
| 2011×2012-1 |
=
| 2008+2007×2009 |
| 2007×2009+2009-1 |
+
| 2009+2008×2010 |
| 2008×2010+2010-1 |
+
| 2010+2009×2011 |
| 2009×2011+2011-1 |
+
| 2011+2010×2012 |
| 2010×2012+2012-1 |
,
=
| 2008+2007×2009 |
| 2008+2007×2009 |
+
| 2009+2008×2010 |
| 2009+2008×2010 |
+
| 2010+2009×2011 |
| 2010+2009×2011 |
+
| 2011+2010×2012 |
| 2011+2010×2012 |
,
=1+1+1+1,
=4.
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