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123/15252/332+(2/333+4/333+……+332/333)-(1/333+3/333+……+331/333)
人气:108 ℃ 时间:2020-04-23 07:48:22
解答
123/15252/332+(2/333+4/333+……+332/333)-(1/333+3/333+……+331/333)
=1/124/332+166/333
=1/2
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