72*55+28*56用简便方法算

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72*55+28*56用简便方法算72*55+28*56用简便方法算72*55+28*56用简便方法算原式=72*55+28*55+28=(72+28)*55+28=5500+28=5528

72*55+28*56用简便方法算
72*55+28*56用简便方法算

72*55+28*56用简便方法算
原式=72*55+28*55+28 =(72+28)*55+28 =5500+28 =5528