41点二乘以八点一+十一乘以九又四分之一加53点七乘以1.9
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原式=41.2×8.1+11×9.25+53.7×1.9
=41.2×8.1+11×9.25+（41.2+12.5）×1.9
=41.2×（8.1+1.9）+11×9.25+12.5×1.9
=41.2×10+11×9.25+19×1.25
=412+11×8+（11+19）×1.25
=412+88+30×1.25
=500+37.5
=537.5
=41.2×8.1+11×9.25+（41.2+12.5）×1.9
=41.2×（8.1+1.9）+11×9.25+12.5×1.9
=41.2×10+11×9.25+19×1.25
=412+11×8+（11+19）×1.25
=412+88+30×1.25
=500+37.5
=537.5
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