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用简便方法计算 2.02x8.5 1.6x7.5x1.25

2.02x8.5 =(2+0.02)*8.5 =2*8.5+0.02*8.5 =17+0.17 =17.17 1.25+4.6+0.75 =(1.25+0.75)+4.6 =2+4.6 =6.6 1.6x7.5x1.25 =0.8*2*7.5*1.25 =(0.8*1.25)*(2*7.5) =1*15 =15 56x1.25 =7*(8*1.25) =7*10 =70 3.4x7x1.5 = 3.4*(7*1.5) = 3....

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