如果有理数a,b满足|ab-2|+(1-6)的平方=0试求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.+1/(a+2009)(b+2009)
问题描述:
如果有理数a,b满足|ab-2|+(1-6)的平方=0试求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.+1/(a+2009)(b+2009)
答
|ab-2|+(1-b)的平方=0ab-2=0,1-b=0a=2,b=11/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.+1/(a+2009)(b+2009) =1/2+1/(2×3)+1/(3×4)+……+1/(2010×2011)=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2010-...