原式=1/(1*3)+1/(2*4)+1/(3*5)+……+1/(98*100)+1/(99*101)+1/(100*102)
=2*(1-1/3+1/2-1/4+1/3-1/5+……+1/98-1/100+1/99-1/101+1/100-1/102)
=2*(1+1/2-1/101-1/102)
结果自己算吧,过程就是这样
原式=1/(1*3)+1/(2*4)+1/(3*5)+……+1/(98*100)+1/(99*101)+1/(100*102)
=2*(1-1/3+1/2-1/4+1/3-1/5+……+1/98-1/100+1/99-1/101+1/100-1/102)
=2*(1+1/2-1/101-1/102)
结果自己算吧,过程就是这样