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2.9+2.99+2.999+2.9999如何快速计算结果
123724119
2024-09-24 14:55:40
解题:2.9+2.99+2.999+2.9999=(3-0.1)+(3-0.01)+(3-0.001)+(3-0.0001)=3x4-(0.1+0.01+0.001+0.0001)=12-0.1111为什么要把 2.9、2.99、2.999、2.9999 转化成 3 减去相应的小数呢?因为把它们转化成 3 减去相应小数,是为了凑整方便计算,这样能让加法变得更简单,最后再统一减去多算的部分。=11.8889
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