41.2*8.1+11*9.25+537*0.19
=41.2*8.1+53.7*1.9+11*9.25
=41.2*（10-1.9）+53.7*1.9+11*9.25
=41.2*10-（41.2-53.7）*1.9+11*9.25
=412+12.5*1.9+11*9.25
=412+（1.1+0.8）*12.5+1.1*92.5
=412+10+（12.5+92.5）*1.1
=422+（100+5）*1.1
=422+110+5.5
=537.5
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