1/1*7+1/7*13+1/13*19+~+1/97*103用简便算法,

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1/1*7+1/7*13+1/13*19+~+1/97*103用简便算法,

1/1*7+1/7*13+1/13*19+~+1/97*103用简便算法,
1/1*7+1/7*13+1/13*19+~+1/97*103
用简便算法,

1/1*7+1/7*13+1/13*19+~+1/97*103用简便算法,
1/1*7+1/7*13+1/13*19+~~~+1/97*103
=(6/1*7+6/7*13+6/13*19+~~~+6/97*103)/6
=[(1/1-1/7)+(1/7-1/13)+(1/13-1/19)+~~~+(1/97-1/103)]/6
=(1-1/103)/6
=17/103

1/1*7+1/7*13+1/13*19+~~~+1/97*103
=[1-(1/7)]*(1/6)+[(1/7)-(1/13)]*(1/6)+[(1/13)-(1/19)]*(1/6)+~~~+[(1/97)-(1/103)]*(1/6)
=[1-(1/103)]*(1/6)=17/103

1/1*7+1/7*13+1/13*19+~~~+1/97*103
=1/6*(1-1/7)+1/6*(1/7-1/13)+1/6*(1/13-1/19)+……+1/6*(1/97-1/103)
=1/6*(1-1/7+1/7-1/13+1/13-……+1/97-1/103)
=1/6*(1-1/103)
=1/6*(102/103)
=17/103

=1/6*(1-1/7+1/7-1/13+1/13-1/19+………………~~+1/97-1/103)
=1/6*102/103
=17/103