计算:1/1×2+1/2×3+1/3×4+...+1/2004×2005+1/2005×2006×1/2006×2007.
问题描述:
计算:1/1×2+1/2×3+1/3×4+...+1/2004×2005+1/2005×2006×1/2006×2007.
答
=2004/2005
计算:1/1×2+1/2×3+1/3×4+...+1/2004×2005+1/2005×2006×1/2006×2007.
=2004/2005