已知|xy-2|与|y-2|互为相反数,试求代数式1/xy+1/(x+1)*(y+1)+1/(x+2)*(y+2)+.+1/(x+2014)*(y+2014)的值.
问题描述:
已知|xy-2|与|y-2|互为相反数,试求代数式1/xy+1/(x+1)*(y+1)+1/(x+2)*(y+2)+.+1/(x+2014)*(y+2014)的值.
答
∵|xy-2|与|y-2|互为相反数∴|xy-2|+|y-2|=0∴xy-2=0y-2=0∴x=1y=2∴1/xy+1/(x+1)*(y+1)+1/(x+2)*(y+2)+.+1/(x+2014)*(y+2014)=1/1×2+1/2×3+1/3×4+……+1/2015×2016=1-1/2+1/2-1/3+1/3-1/4+……...太给力了,你的回答已经完美的解决了我问题!