原式=(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+……+(1/97-1/99)
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+……+1/97-1/99
=1/3-1/99
=33/99-1/99
=32/99
原式=(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+……+(1/97-1/99)
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+……+1/97-1/99
=1/3-1/99
=33/99-1/99
=32/99