来自梁兆宽的问题
【简算:1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+……+1/(99*100)是1×2】
简算:
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+……+1/(99*100)
是1×2


【简算:1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+……+1/(99*100)是1×2】
简算:
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+……+1/(99*100)
是1×2
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+.+1/98-1/99+1/99-1/100
=1-1/100
=99/100