1/1x2+1/2x3+1/3x4+...+1/49x50怎么计算
问题描述:
1/1x2+1/2x3+1/3x4+...+1/49x50怎么计算
答
1/1x2+1/2x3+1/3x4+...+1/49x50
=1-1/2+1/2-1/3+1/3-1/4+……+1/49-1/50
=1-1/50
=49/50