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数学
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5/9-1/25+4/9-4/25=?简便计算
人气:217 ℃ 时间:2020-05-12 14:34:51
解答
5/9-1/25+4/9-4/25
=(5/9+4/9)-(1/25+4/25)
=1-1/5
=4/5
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