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4-[(+3又4分之1)+(+2.75)] 怎么算
人气：236 ℃　时间：2019-12-16 10:42:46
解答
4-[(+3又1/4)+(+2.75)]
=4-[(13/4)+2.75]
=4-[3.25+2.75]
=4-6
=-2
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