1/3*5+1/5*7+1/7*9+.+1/2001*2003

问题描述:

1/3*5+1/5*7+1/7*9+.+1/2001*2003

1/3*5+1/5*7+1/7*9+.+1/2001*2003
=1/2*(1/3-1/5 +1/5-1/7 +.+1/2001-1/2003)
=1/2*(1/3- 1/2003)
=1000/6009