小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程
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小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程
十万火急
十万火急
![小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程](/uploads/image/z/7144181-53-1.jpg?t=%E5%B0%8F%E6%95%B0%E7%9A%84%E5%B7%A7%E7%AE%9741.2%2A8.1%2B11%2A1.25%2B53.7%2A1.9%E7%9A%84%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B)
41.2*8.1+11*1.25+53.7*1.9
=41.2*(10-1.9)+11*1.25+53.7*1.9
=41.2*10-41.2*1.9+53.7*1.9+11*1.25
=412+12.5*1.9+1.1*12.5
=412+12.5*(1.9+1.1)
=412+12.5*3
=412+37.5
=449.5
=41.2*(10-1.9)+11*1.25+53.7*1.9
=41.2*10-41.2*1.9+53.7*1.9+11*1.25
=412+12.5*1.9+1.1*12.5
=412+12.5*(1.9+1.1)
=412+12.5*3
=412+37.5
=449.5