|a-1|+|ab-2|=0
a-1=0 a=1
ab-2=0 b=2/a=2
1/ab+(1/a+1)(1/b+2)+.1/(a+2005)(b+2005)
=1/1x2+1/2x3+.+1/2006x2007
=1-1/2+1/2-1/3+.1/2006-1/2007
=1-1/2007
=2006/2007
|a-1|+|ab-2|=0
a-1=0 a=1
ab-2=0 b=2/a=2
1/ab+(1/a+1)(1/b+2)+.1/(a+2005)(b+2005)
=1/1x2+1/2x3+.+1/2006x2007
=1-1/2+1/2-1/3+.1/2006-1/2007
=1-1/2007
=2006/2007