【脱式计算&nbsq;19×m4+m4×89&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;&nbsq;16×38−38×16&nbsq;&nbsq;&nbsq;&am

　　脱式计算

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