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41.2x8.1+1又4分之1+53.7x1.9
=41.2x(10-1.9)+1.25+53.7x1.9
=41.2x10-41.2x1.9+53.7x1.9+1.25
=41.2x10+(53.7-41.2)x1.9+1.25
=412+12.5x1.9+12.5x0.1
=412+12.5x(1.9+0.1)
=412+25
=437
=41.2x(10-1.9)+1.25+53.7x1.9
=41.2x10-41.2x1.9+53.7x1.9+1.25
=41.2x10+(53.7-41.2)x1.9+1.25
=412+12.5x1.9+12.5x0.1
=412+12.5x(1.9+0.1)
=412+25
=437
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