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|1/10-1/11|+|1/11-1/12|+…|1/19-1/20|
人气:494 ℃ 时间:2020-06-01 09:28:22
解答
|1/10-1/11|+|1/11-1/12|+…|1/19-1/20|
=1/10-1/11+1/11-1/12+…+1/19-1/20
=1/10-1/20
=1/20
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