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7.2×38.6 72×6.24-7.2等于多少简便计算
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2016-07-13 · 知道合伙人教育行家
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7.2×38.6+72×6.24-7.2
=7.2x38.6+7.2x62.4-7.2
=7.2x(38.6+62.4-1)
=7.2x100
=720
=7.2x38.6+7.2x62.4-7.2
=7.2x(38.6+62.4-1)
=7.2x100
=720
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