55.5+72×0.2-14.4简便计算

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55.5+72×0.2-14.4简便计算

55.5+72×0.2-14.4简便计算
55.5+72×0.2-14.4简便计算

55.5+72×0.2-14.4简便计算
55.5+72×0.2-14.4
=55.5-14.4-14.4
=55.5