1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+```+1/29*30_数学解答

1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+```+1/29*30

人气：419 ℃　时间：2020-04-11 07:44:43

解答

1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+```+1/29*30
=1-1/2+1/2-1/3+.+1/29-1/30
=1-1/30
=29/30