问题
解答题
设M=
|
答案
∵M=
+
-12 (1+
)(2
-1)2
+…+
-3 2 (
+2
)(3
-3
)2
-2009 2008 (
+2008
)(2009
-2009
)2008
=
-1+2
-3
+2
-4
+…+3
-2009 2008
=
-1,2009
N=(1-2)+(3-4)+(5-6)+…+=(-1)+(-1)+…+(-1)=-1005,
∴
=N (M+1)2+1
=--1005 (
-1+1)2+12009
.1 2