41.2*8.1+11*1.25+53.7*1.9
=41.2*8.1+53.7*(10-8.1)+11*1.25
=41.2*8.1+53.7*10-53.7*8.1+11*1.25
=53.7*10-(53.7-41.2)*8.1+11*1.25
=537-12.5*8.1+1.1*12.5
=537-12.5*(8.1-1.1)
=537-12.5*7
=537-87.5
=449.5
=41.2*8.1+53.7*(10-8.1)+11*1.25
=41.2*8.1+53.7*10-53.7*8.1+11*1.25
=53.7*10-(53.7-41.2)*8.1+11*1.25
=537-12.5*8.1+1.1*12.5
=537-12.5*(8.1-1.1)
=537-12.5*7
=537-87.5
=449.5
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第1个回答 2011-09-28
41.2*8.1+11*1.25+53.7*1.9
=41.2*8.1+11*1.25+(41.2+12.5)*1.9
=41.2*8.1+41.2*1.9+11*1.25+12.5*1.9
=41.2*(8.1+1.9)+12.5*(1.1+1.9)
=412+12.5*3
=412+37.5
=449.5
=41.2*8.1+11*1.25+(41.2+12.5)*1.9
=41.2*8.1+41.2*1.9+11*1.25+12.5*1.9
=41.2*(8.1+1.9)+12.5*(1.1+1.9)
=412+12.5*3
=412+37.5
=449.5
第2个回答 2011-09-18
0.25=1/4,11*0.25=11/4=2+3/4=2.75
41.2*8.1+11*1.25+53.7*1.9=41.2*(8+0.1)+11*(1+0.25)+53.7*(2-0.1)=41.2*8+41.2*0.1+11*1+11*0.25+53.7*2-53.7*0.1=329.6+4.12+11+2.75+107.4-5.37=449.5
41.2*8.1+11*1.25+53.7*1.9=41.2*(8+0.1)+11*(1+0.25)+53.7*(2-0.1)=41.2*8+41.2*0.1+11*1+11*0.25+53.7*2-53.7*0.1=329.6+4.12+11+2.75+107.4-5.37=449.5
第3个回答 2011-09-19
41.2*8.1+11*1.25+(41.2+12.5)*1.9
41.2*8.1+41.2*1.9+11*1.25+12.5*1.9
41.2*(8.1+1.9)+12.5*(1.1+1.9)
41.2*10+12.5*3
412+37.5
449.5
41.2*8.1+41.2*1.9+11*1.25+12.5*1.9
41.2*(8.1+1.9)+12.5*(1.1+1.9)
41.2*10+12.5*3
412+37.5
449.5
第4个回答 2011-09-25
42.5＋45.6×456.8
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