40.25-((37.75+12又1/4)*1/5-15)-4

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40.25-((37.75+12又1/4)*1/5-15)-4

40.25-[(37.75+12又1/4)*1/5-15]-4
=40.25-[50*1/5-15]-4
=40.25+5-4
=41.25