1/99+2/99+3/99+…+296/99=?
问题描述:
1/99+2/99+3/99+…+296/99=?
1/1001+2/1001+3/1001+…2001/1001=?
答
1
=(1+2+.296)/99
=(296*297/2)/99
=444
2
=(1+2+...+2001)/1001
=(2001*2002/2)/1001
=1001