求和:1+1/2+2/2+1/3+2/3+3/3+2/3+1/3+……+1/100+2/100+…+100/100+99/100+…+2/100+1/100
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求和:1+1/2+2/2+1/3+2/3+3/3+2/3+1/3+……+1/100+2/100+…+100/100+99/100+…+2/100+1/100
求和:1+1/2+2/2+1/3+2/3+3/3+2/3+1/3+……+1/100+2/100+…+100/100+99/100+…+2/100+1/100
求和:1+1/2+2/2+1/3+2/3+3/3+2/3+1/3+……+1/100+2/100+…+100/100+99/100+…+2/100+1/100
1+1/2+2/2+1/2+1/3+2/3+3/3+2/3+1/3…+1/100+2/100+…100/100+99/100+…+1/100
=1+2+3+...+100
=5050
1/n+2/n+...+n/n+(n-1)/n+...+2/n+1/n
=[n(n+1)/2+(n-1)n/2]/n
=n
1+1/2+2/2+1/2+1/3+2/3+3/3+2/3+1/3…+1/100+2/100+…100/100+99/100+…+1/100
=1+2+3+...+100
=100*(100+1)/2
=5050
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