0.75×2.9+9.3×0.25的简便方式
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因为9.3×0.25=3.1×3×0.25=3.1×0.75，所以原式等于0.75×2.9+0.75×3.1运用乘法分配律逆运算就是有0.75×（2.9+3.1）=0.75×6=4.5。
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0.75×2.9+9.3×0.25
=0.25×3×2.9+9.3×0.25
=0.25×8.7+9.3×0.25
=0.25×(8.7+9.3)
=0.25×18
=0.25×10+0.25×4×2
=2.5+1×2
=4.5
=0.25×3×2.9+9.3×0.25
=0.25×8.7+9.3×0.25
=0.25×(8.7+9.3)
=0.25×18
=0.25×10+0.25×4×2
=2.5+1×2
=4.5
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0.75×2.9+9.3×0.25
=0.75×2.9+（2.9+6.4）×0.25
=0.75×2.9+2.9×0.25+6.4×0.25
=2.9×（0.75+0.25）+6.4×0.25
=2.9×1+1.6×（4×0.25）
=2.9+16
=18.9
=0.75×2.9+（2.9+6.4）×0.25
=0.75×2.9+2.9×0.25+6.4×0.25
=2.9×（0.75+0.25）+6.4×0.25
=2.9×1+1.6×（4×0.25）
=2.9+16
=18.9
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