求和:1+1/1*2+1/2*3+...+1/99*100=
问题描述:
求和:1+1/1*2+1/2*3+...+1/99*100=
答
1+1/1*2+1/2*3+...+1/99*100
=1+1-1/2+1/2-1/3+.+1/99-1/100
=2-1/100
=200/100-1/100
=199/100