20.09*48-200.9*1.4+2009*0.66 =2009*0.01*48-2009*0.1*1.4+2009*0.66 =2009*(0.48-0.14+0.66) =2009*1 =2009
20.09*48-200.9*1.4+2009*0.66[简便计算,*代表乘号】
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