(0.75*57.4-0.574*25+57.4)/3 用简便方法

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(0.75*57.4-0.574*25+57.4)/3用简便方法(0.75*57.4-0.574*25+57.4)/3用简便方法(0.75*57.4-0.574*25+57.4)/3用简便方法(0.7

(0.75*57.4-0.574*25+57.4)/3 用简便方法
(0.75*57.4-0.574*25+57.4)/3 用简便方法

(0.75*57.4-0.574*25+57.4)/3 用简便方法
(0.75*57.4-0.574*25+57.4)/3
=(0.75*57.4-57.4*0.25+57.4)/3
=[57.4*(0.75-0.25+1)]/3
=57.4*1.5/3
=57.4*0.5
=28.7