|1-1/2|+|1/2-1/3|+|1/3-1/4|+……+|1/99-1/100| =1-1/2+1/2-1/3+1/3-1/4.+1/99-1/100 =1-1/100 =99/100
计算:|1-1/2|+|1/2-1/3|+|1/3-1/4|+……+|1/99-1/100|
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