1/2006+1/2007+1/2008+1/2009=?
问题描述:
1/2006+1/2007+1/2008+1/2009=?
答
1/2006+1/2007+1/2008+1/2009=(2007x2008x2009+2006x2008x2009+2006x2007x2008)/(2006x2007x2008x2009)
1/2006+1/2007+1/2008+1/2009=?
1/2006+1/2007+1/2008+1/2009=(2007x2008x2009+2006x2008x2009+2006x2007x2008)/(2006x2007x2008x2009)