1/1*2+1/2*3+1/3*4+1/4*5+.+1/2006*2007
问题描述：
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2006*2007
答
1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)+……+1/(2006×2007)=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/2005-1/2006)+(1/2006-1/2007)=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/2005-1/2006+1/2006-1/2007=1-1/20...