问题
解答题
计算:(
|
答案
(
+1
+12
+1
+3 2
+…+1
+4 3
)(1
+2009 2008
+1)2009
=(
-1+2
-3
+…+2
-2009
)(2008
+1)2009
=(
+1)(2009
-1)2009
=2009-1
=2008.
计算:(
|
(
+1
+12
+1
+3 2
+…+1
+4 3
)(1
+2009 2008
+1)2009
=(
-1+2
-3
+…+2
-2009
)(2008
+1)2009
=(
+1)(2009
-1)2009
=2009-1
=2008.