简便方法计算 0.9*4.2*9.1
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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
=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
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