41.2x8.1+11x1.25+53.7x1.9怎样算简单

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41.2x8.1+11x1.25+53.7x1.9怎样算简单41.2x8.1+11x1.25+53.7x1.9怎样算简单41.2x8.1+11x1.25+53.7x1.9怎样算简单41.2x8.1+1

41.2x8.1+11x1.25+53.7x1.9怎样算简单
41.2x8.1+11x1.25+53.7x1.9怎样算简单

41.2x8.1+11x1.25+53.7x1.9怎样算简单
41.2x8.1+11x1.25+53.7x1.9
=41.2x8.1+41.2×1.9+12.5×1.9+1.1x12.5
=41.2×(8.1+1.9)+12.5×(1.9+1.1)
=41.2×10+12.5×3
=412+37.5
=449.5

由于8.1+1.9=10,先将53.7=41.2+12.5
41.2x8.1+11x1.25+53.7x1.9
=41.2*10+12.5*1.9+11*1.25
=412+1.25*19+1.25*11
=412+1.25*(19+11)
=412+1.25*30
=412+37.5
=449.5