2010×2012×(1/2010×2011+1/2011×2012)
问题描述:
2010×2012×(
+1 2010×2011
) 1 2011×2012
答
2010×2012×(
+1 2010×2011
),1 2011×2012
=2010×2012×(
-1 2010
+1 2011
-1 2011
),1 2012
=2010×2012×(
-1 2010
),1 2012
=2010×2012×
-2010×2012×1 2010
,1 2012
=2012-2010,
=2.