(1/2+1)(1/2-1)(1/3+1)(1/3-1).(1/99+1)(1/99-1)=?今天就要答案,
问题描述:
(1/2+1)(1/2-1)(1/3+1)(1/3-1).(1/99+1)(1/99-1)=?今天就要答案,
答
=1/2*3/2*2/3*4/3*3/4*5/4*4/5*6/5*.*98/99*100/99
=1/2*100/99
=50/99