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数学
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9+99+999+9999+99999+999999-10000
简洁明了者
人气:122 ℃ 时间:2019-12-21 08:20:27
解答
10-1+100-1+1000-1+10000-1+100000-1+1000000-1--10000
=1111111-6+10000
=1110104
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