(1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)

问题描述:

(1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)
1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)这是题

(1/2+1/3+1/4+...+1/2010)(1+1/2+1/3+...+1/2009)-(1+1/2+1/3+...+1/2010)(1/2+1/3+1/4+...+1/2009)令1/2+1/3+1/4+...+1/2009=k则原式=(k+1/2010)(1+k)-(1+k+1/2012)k=k+k²+1/2010+1/2010k-k-k²-1...