41.2*8.1+11*1.25+53.7*1.9最简单口算方法
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41.2*8.1+11*1.25+53.7*1.9最简单口算方法
![41.2*8.1+11*1.25+53.7*1.9最简单口算方法](/uploads/image/z/7144184-56-4.jpg?t=41.2%2A8.1%2B11%2A1.25%2B53.7%2A1.9%E6%9C%80%E7%AE%80%E5%8D%95%E5%8F%A3%E7%AE%97%E6%96%B9%E6%B3%95)
41.2*10-41.2*1.9+11*1.25+53.7*1.9
=412+12.5*1.9+11*1.25
=412+12.5*1.9+12.5+1.25
=412+12.5*2-1.25+12.5-1.25
=412+25+12.5=437+12.5=449.5
=412+12.5*1.9+11*1.25
=412+12.5*1.9+12.5+1.25
=412+12.5*2-1.25+12.5-1.25
=412+25+12.5=437+12.5=449.5