问题
解答题
观察下列等式:
(1)直接写出下列各式的计算结果:
(2)探究并计算:
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答案
(1)原式=1-
+1 2
-1 2
+1 3
-1 3
+…+1 4
-1 2006
=1-1 2007
=1 2007
;2006 2007
(2)原式=
(1 4
+1 1×2
+1 2×3
+…+1 3×4
)1 1003×1004
=
(1-1 4
+1 2
-1 2
+1 3
-1 3
+…+1 4
-1 1003
)1 1004
=
(1-1 4
)=1 1004
.1003 4016
故答案为:(1)2006 2007