41.2×8.1+11×1.25+53.7×1.9=41.2×(10-1.9)+53.7×1.9+11×1.25=412+12.5×1.9+1.1×12.5 =412+12.5×(1.1+1.9)=412+12.5X3=449.5
41.2乘8.1加上11乘1.25加53.7乘地1.9用简便方法怎么计算
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