3.6x42.3x3.75-12.5x0.423x16=36x0.423x37.5-12.5x0.423x16=4x9x0.423x12.5x3-12.5x0.423x4x4=4x12.5x0.423x（3x9-4）=50x23x0.423=115x4.23=486.45
3.6×42.3×3.75－12.5×0.423×16 要简便运算!
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