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12.8x(3.27一o.53)十4.2x13.7的简便方法

简便方法 12.8x(3.27一0.53)十4.2x13.7 =12.8x2.74十4.2x13.7 =12.8x27.4十2.1x27.4 =(12.8+2.1)×27.4 =14.9×27.4 =408.26

12.8x2.6+7.4x12.8 =12.8×(2.6+7.4) =12.8×10 =128

0,8x[13一(3,12十5,25)] =0.8*(13-8.37) =0.8*4.63 =3.704

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