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4.7×2.8+2.5×2.8+7.2×7.2(用简便方法计算)
人气:260 ℃ 时间:2020-05-10 17:48:23
解答
4.7×2.8+2.5×2.8+7.2×7.2
=(4.7+2.5)×2.8+7.2×7.2
=7.2×2.8+7.2×7.2
=7.2×(2.8+7.2)
=72
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