72×56+28×56 = = = 怎样简便怎样算.
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72×56+28×56===怎样简便怎样算.72×56+28×56===怎样简便怎样算.72×56+28×56===怎样简便怎样算.(72+28)*56
72×56+28×56 = = = 怎样简便怎样算.
72×56+28×56 = = = 怎样简便怎样算.
72×56+28×56 = = = 怎样简便怎样算.
(72+28)*56