问题
解答题
已知:|ab-2|+(b+1)2=0, 求:(1)a,b的值; (2)b2011-(
(3)
|
答案
(1)∵|ab-2|+(b+1)2=0,
∴ab-2=0,b+1=0,
解得:a=-2,b=-1;
(2)当a=-2,b=-1时,b2011-(
)2011=(-1)2011-(a 2
)2011-2 2
=-1-(-1)
=0.
(3)当a=-2,b=-1时,
+1 ab
+1 (a-1)(b-1)
+…+1 (a-2)(b-2) 1 (a-2012)(b-2012)
=
+1 (-2)×(-1)
+1 (-3)×(-2)
+…+1 (-4)×(-3) 1 (-2014)×(-2013)
=1-
+1 2
-1 2
+1 3
-1 3
+…+1 4
-1 2013 1 2014
=1-1 2014
=
.2013 2014