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2.6×0.39+2.7×0.38+2.8×0.37求和的简便算法
人气:389 ℃ 时间:2020-04-28 08:19:43
解答
(2.7-0.1)×(0.38+0.01)+2.7×0.38+(2.7+0.1)×(0.38-0.01)
=2.7×0.38×3-2×0.1×0.01
=3.076
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