1楼快乐宝宝快乐妈
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发表于 2007-11-17 20:26
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1+1/2+5/6+11/12+19/20+29/30+41/42+55/56+......+9701/ 9702+9899/9900
=1+(1*2-1)/(1*2)+(2*3-1)/(2*3)+......+(99*100-1)/(99*100)
=100-[1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+ ……+1/(99*100)]
=100-[1-1/100]
=99+1/100
=99.01.