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4.2×1.2-5.2×0.7的简便运算
人气:259 ℃ 时间:2020-04-19 19:02:11
解答
4.2×1.2-5.2×0.7 =0.7×6×1.2-5.2×0.7 =0.7×7.2-5.2×0.7 =0.7×(7.2-5.2) =0.7×2 =1.4
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