1,
30*31/2*32/3*33/4*.59/30*60/31
----------------------------------
32*33/2*34/3*35/4*.59/28*60/29
=30*31*1/30*1/31
=1
2,
=2004*(1998^2-1998*1997+1997^2)/[1998^2-(1998-1)]
=2004*[(1998-1997)^2+1998*1997]/(1998*1997+1)
=2004
1,
30*31/2*32/3*33/4*.59/30*60/31
----------------------------------
32*33/2*34/3*35/4*.59/28*60/29
=30*31*1/30*1/31
=1
2,
=2004*(1998^2-1998*1997+1997^2)/[1998^2-(1998-1)]
=2004*[(1998-1997)^2+1998*1997]/(1998*1997+1)
=2004