问题
填空题
计算|
|
答案
|
-1 2009
|+|1 2008
-1 2008
|-|1 2007
-1 2009
|1 2007
=
-1 2008
+1 2009
-1 2007
-1 2008
+1 2007 1 2009
=0.
故答案为:0.
计算|
|
|
-1 2009
|+|1 2008
-1 2008
|-|1 2007
-1 2009
|1 2007
=
-1 2008
+1 2009
-1 2007
-1 2008
+1 2007 1 2009
=0.
故答案为:0.