0.125x45x3简便计算？
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0.125×45×3
=0.125×40×3+0.125×5×3
=0.125×8×5×3+0.125×15
=1×15+0.125×16-0.125×1
=15+0.125×8×2-0.125
=15+2-0.125
=16.875
=0.125×40×3+0.125×5×3
=0.125×8×5×3+0.125×15
=1×15+0.125×16-0.125×1
=15+0.125×8×2-0.125
=15+2-0.125
=16.875
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