486*240+140*24的巧算
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486*240+140*24=486x240+14x240=(486+14)X240=500x240=1000x120=
咨询记录 · 回答于2022-09-03
486*240+140*24的巧算
快点
486*240+140*24=486x240+14x240=(486+14)X240=500x240=1000x120=
=120000
那322*290+6780*29
322*290+6780*29=322x290+678x290
=(322+678)x290
=1000x290=290000