1/1x3+1/3x5+1/5x7+...+1/97x99=?
问题描述:
1/1x3+1/3x5+1/5x7+...+1/97x99=?
答
1/1x3+1/3x5+1/5x7+...+1/97x99
=1/2(1-1/3+1/3-1/5+1/5-1/7+...+1/97-1/99)
=1/2(1-1/99)
=49/99