67*1/4+2又1/2*3.75-4又1、2*25% 简便运算哦!
4个回答
67*1/4+2又1/2*3.75-4又1/2*25%
=67*0.25+0.25*37.5-4.5*0.25
=0.25*(67+37.5-4.5)
=0.25*100
=25
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