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数学
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9.9+99.9+999.9+9999.9求巧算
人气:211 ℃ 时间:2019-09-27 15:34:47
解答
9.9+99.9+999.9+9999.9
=(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)
=11110-0.4
=11109.6
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