简便方法计算 0.9*4.2*9.1

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简便方法计算0.9*4.2*9.1简便方法计算0.9*4.2*9.1简便方法计算0.9*4.2*9.10.9*4.2*9.1=(1-0.1)*4.2*9.1=4.2*9.1-4.2*0.91=4.2(

简便方法计算 0.9*4.2*9.1
简便方法计算 0.9*4.2*9.1

简便方法计算 0.9*4.2*9.1
0.9*4.2*9.1=(1-0.1)*4.2*9.1
=4.2*9.1-4.2*0.91
=4.2(9.1-0.91)
=4.2*8.19
=4*8.19+0.2*8.19
=32.76-1.638
=31.122