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*(11+1.9)
仅供参考，祝你学习进步
好不容易才算出来的：41.2x8.1+11x9.25+53.7x1.9=537.5
41.2×8.1+11×9.25+53.7×1.9
=333.72+101.75+102.03
=537.5
41.2*8.1+11*9.25+53.7*1.9=537.5
537.5
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