1-1/2+1/2-1/3+1/3-1/4+...1/9-1/10=1-1/10=9/10
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
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相关问题
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1/1*2+1/2*3+1/3*4+···1/8*9+1/9*10简便计算