已知﹙a-1﹚2+|ab-2|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+…+1/(a+2013)(b+2013)的值.
问题描述:
已知﹙a-1﹚2+|ab-2|=0,求
+1 ab
+1 (a+1)(b+1)
+…+1 (a+2)(b+2)
的值. 1 (a+2013)(b+2013)
答
∵﹙a-1﹚2+|ab-2|=0,
∴a-1=0,ab-2=0,
解得:a=1,b=2,
则原式=
+1 1×2
+…+1 2×3
=1-1 2014×2015
+1 2
-1 2
+…+1 3
-1 2014
=1-1 2015
=1 2015
.2014 2015