41.2*8.1+11*1.25+53.7*1.9的简算
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=41.2*8.1+11*1.25+(41.2+12.5)*1.9
=41.2*(8.1+1.9)+11*1.25+12.5*1.9
=412+12.5*(1.1+1.9)
=412+12.5*3
=412+37.5
=449.5
=41.2*(8.1+1.9)+11*1.25+12.5*1.9
=412+12.5*(1.1+1.9)
=412+12.5*3
=412+37.5
=449.5
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