41.2x8.1+11x1.25+53.7x1.9

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41.2x8.1+11x1.25+53.7x1.941.2x8.1+11x1.25+53.7x1.941.2x8.1+11x1.25+53.7x1.941.2x8.1+11x1.25+53.7x1.9

41.2x8.1+11x1.25+53.7x1.9
41.2x8.1+11x1.25+53.7x1.9

41.2x8.1+11x1.25+53.7x1.9
41.2x8.1+11x1.25+53.7x1.9
=41.2x8.1+(41.2+12.5)x1.9+11x1.25
  =41.2x8.1+41.2×1.9+12.5×1.9+11x1.25
  =41.2x(8.1+1.9)+19×1.25+11x1.25
  =412+1.25(19+11)
  =412+1.25x30
  =412+37.5
  =449.5

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