已知|a-b-1|+|b-1|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)的值
问题描述:
已知|a-b-1|+|b-1|=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)的值
答
|a-b-1|+|b-1|=0∴a-b-1=0b-1=0∴a=2b=11/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=1/1×2+1/2×3+1/3×4+……+1/2013×2014=1-1/2+1/2-1/3+1/3-1/4+……+1/2013-1/2014=1-1/2014=2013/2014...