求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/60+……+58/60+59/60

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求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/60+……+58/60+59/60求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/6

求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/60+……+58/60+59/60
求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/60+……+58/60+59/60

求和:1/2+1/3+2/3+1/4+2/4+3/4+……1/60+2/60+3/60+……+58/60+59/60
1/n+2/n+3/n+.(n-1)/n
=(1+2+3+.n-1)/n
=(n-1)/2
1/2+1/3+2/3+1/4+2/4+3/4+……+1/60+2/60+3/60……+58/60+59/60
=1/2+(3-1)/2+(4-1)/2+.+(60-1)/2
=(1+2+3.+59)/2
=60*59/4
=885