简算1x1/2+1/2x1/3.1/99x1/100
问题描述:
简算1x1/2+1/2x1/3.1/99x1/100
要方法
答
1x1/2+1/2x1/3.1/99x1/100
=1-1/2+1/2-1/3+...+1/99-1/100
=1-1/100
=99/100