|1/2001-1/2000|+|1/2000-1/1999|-|1/1999-1/2001|等于多少?说明:|...|是绝对值1/2000是分数,后面依次类推
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|1/2001-1/2000|+|1/2000-1/1999|-|1/1999-1/2001|等于多少?说明:|...|是绝对值1/2000是分数,后面依次类推
|1/2001-1/2000|+|1/2000-1/1999|-|1/1999-1/2001|等于多少?
说明:|...|是绝对值
1/2000是分数,后面依次类推
|1/2001-1/2000|+|1/2000-1/1999|-|1/1999-1/2001|等于多少?说明:|...|是绝对值1/2000是分数,后面依次类推
=1/2000-1/2001+1/1999-1/2000-1/1999+1/2001
=0