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30x[7.5÷(2.7%1.2)]脱式计算

30x[7.5÷(2.7-1.2)] =30x(7.5÷1.5) =30x5 =150

19.44÷2.7-6.49 =7.2-6.49 =0.71

2.7×1.2 27×0.23 0.27×33的脱式计算简便 =2.7x(1.2+10x0.23+0.1x33) =2.7x(1.2+2.3+3.3) =2.7x6.8 =18.36

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