问题
解答题
观察下列等式:
(1)猜想并写出:
(2)直接写出下列各式的计算结果: ①
②
(3)探究并计算:
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答案
(1)
-1 n
;1 n+1
(2)①
;2006 2007
②
;n n+1
(3)原式=
(1 2
-1 2
)+1 4
(1 2
-1 4
)+1 6
(1 2
-1 6
)+…+1 8
(1 2
-1 2006
)1 2008
=
(1 2
-1 2
+1 4
-1 4
+1 6
-1 6
+…+1 8
-1 2006
)1 2008
=
(1 2
-1 2
)1 2008
=1003 4016