계산:(1/2+1/3+...1/2006)(1+1/2+1/3+...1/2005)-(1+1/2+...1/2006)(1/2+1/3+...1/2005) 계산 과정 을 써 내다

계산:(1/2+1/3+...1/2006)(1+1/2+1/3+...1/2005)-(1+1/2+...1/2006)(1/2+1/3+...1/2005) 계산 과정 을 써 내다

원형
=(1/2+1/3+...1/2006)*1+(1/2+1/3+...1/2006)(1/2+1/3+...1/2005)-(1/2+1/3+...1/2005)-(1/2+...1/2006)(1/2+1/3+...1/2005)
=1/2006