问题
解答题
观察下列算式,并进行计算.
|
答案
原式=
(1 2
-1 1
)+1 3
(1 2
-1 3
)+…+1 5
(1 2
-1 2007
)1 2009
=
(1-1 2
+1 3
-1 3
+1 5
-1 5
+…+1 7
-1 2007
)=1 2009
(1-1 2
)=1 2009
×1 2
’=2008 2009 1004 2009
观察下列算式,并进行计算.
|
原式=
(1 2
-1 1
)+1 3
(1 2
-1 3
)+…+1 5
(1 2
-1 2007
)1 2009
=
(1-1 2
+1 3
-1 3
+1 5
-1 5
+…+1 7
-1 2007
)=1 2009
(1-1 2
)=1 2009
×1 2
’=2008 2009 1004 2009