Đáp án:
B=2008/1+2007/2+2006/3+.............+2/2007+1/2008
=1+(2007/2+1)+(2006/3+1)+.................(2/2007+1)+(1/2008+1)
=2009/2009+2009/2+2009/3+.................2009/2007+2009/2008
=2009(1/2+1/3+1/4+...................+1/2007+1/2008+1/2009)
khi đó A/B=20091/2+1/3+1/4+....+1/2007+1/2008+1/2009/2009(1/2+1/3+1/4+.............+1/2007+1/2008+1/2009)