计算:251/2008×2009+251/2009×2010=_.

问题描述:

计算:

251
2008×2009
+
251
2009×2010
=______.

251
2008×2009
+
251
2009×2010

=251×(
1
2008×2009
+
1
2009×2010
),
=251×(
1
2008
-
1
2009
+
1
2009
-
1
2010
),
=251×
2
2008×2010

=
1
8040

故答案为:
1
8040